BACKGROUND

[0001] Toothbrushes are typically used by applying toothpaste or dentifrice to a bristle section on the h ad of the toothbrush, followed by brushing regions of the oral avity (e .g., the teeth or soft tissue such as the tongue and/or gums) with the bristle section. Some toothbrushes have been equipped with internal reservoirs and systems for delivering dentifrice to a user's oral cavity Other toothbrushes have been developed that include dentifrice that is pre-coated onto the bristles. However, in known toothbrushes only dentifrice or a single oral care additive is available for application to a user's oral cavity. Thus, a need exists for a toothbrush having multiple different oral care additiv s for application to a user's oral cavity.

BRIEF SUMMARY

[0002] Exemplary embodiments according to the present disclosure are directed to oral care implements that have at least one spiral bristle extending from the head thereof. The spiral bristle is formed by first and second strand components being intertwined together. In one embodiment each of the first and second strand components comprises a different oral care additive.

[0003] In one aspect the invention can be an oral care implement comprising a handl ; a head coupled to the handle; at least one bristle tuft extending from the head, the at least one bristle tuft comprising at least one spiral bristle comprising coextruded first and second strand components that are mtertwined together to form the at least one spiral bristle; the first strand component comprising a first plastic and a fiist oral care additive; and the second strand component comprising a second plastic and a second oral care additive, wherein the first oral care additive is diff rent than the second oral care additive.

[0004] In another aspect, the invention can be a spiral bristle for an oral care implement comprising oextruded first and second strand components that are mtertwined together; the first strand component comprising a first plastic and a fiist oral care additive; and the second strand component comprising a second plastic and a second oral care additive, wherein the first oral care additive is different than the second oral care additive. [0005] In a further aspect, the invention can be an oral care implement comprising: a handle; a head oupled to the handle; at least one bristle tuft extending from the head, the at least one bristle tuft comprising at least one spiral bristle comprising coextruded first and second strand components that are mtertwined together to form the at least one spiral bristle; the first strand component comprising a first plastic and a first oral care additive; and the second strand component comprising a second plastic and being free of an oral care additive.

[0006] Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:

[0008] Figure 1 is a front perspective view of an oral care implement having spiral bristles according to an embodiment of the present invention;

[0009] Figure 2 is a front perspective view of a spiral bristle in accordance with a first embodiment of the present invention;

[0010] Figure 3 is a front perspective view of a first strand component and a second strand component of a spiral bristle in accordance with a second mbodiment of the present invention;

[0011] Figure 4 is a cross-sectional vie w taken along line IV-IV of FIG. 3;

[0012] Figure 5 A is a sche matic illustration of a bristle having a rounde d tip;

[0013] Figure 5B is a sc hematic illustration of a bristle having a tape red tip;

[0014] Figure 6 is a front perspective view of a spiral bristle in accordance with a third embodiment of the present invention; and

[0015] Figure 7 is a front perspective view of a spiral bristle in accordance with a fourth embodiment of the present invention.

DETAILED DESCRIPTION

[0016] The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way inte nded to limit the invention, its applic ation, or uses . [0017] The description of illustrative embodiments according to principles of the present invention is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description. In the description of einbodiments of the invention discbsed herein, any reference to direction or orientation is merely intended for conv nien e of des ription and is not intended in any way to limit the scope of the present invention. Relative terms such as "lower," ''upp ' "horizontal," 'Vertical," "above," "below," "up," "down," "top" and "bottom" as well as derivatives thereof (e.g., "horizontally" "downwardly" "upwardly," et .) should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description only and do not require that the apparatus be constructed or operated in a particular orientation unless explicitly indicated as such. Terms such as "attached," "affixed," "connected," "coupled," "interconnected," and similar refer to a relationship wherein structures are secured or attached to one another either directly or indirectiylhrough intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise . Moreover, the features and benefits of the inventton are illustrated by reference to the exemplified embodime ts. Accoidingly, the invention expressly should not be limited to such ex mplary embodiments ill ustia ting some possible non- limiting combinatton of features that may exist alone or in other combinations of features; the scope of the inve ntion being defined by the claims app nded her to.

[0018] Referring first to Figure 1, an oral care implement 100 is illustrated in accordance with an embodiment of the present invention. In the exemplified embodiment, the oral care implement 100 is in the form of a manual toothbrush. However, in certain other embodiments the oral care implement 100 can take on other forms such as being a powered toothbrush, a tongue scraper, a gum and soft tissue cleanser, a water pick, an interdental device, a tooth polisher, a specially designed ans te implement having tooth engaging elements or any other type of implement that is commonly used for oral care. Thus, it is to be undeistood that the inventive concepts discussed herein can be applied to any type of oral care implement unless a spe ific type of oral care implement is spec ifie d in the claims .

[0019] The oral care implement extends from a proximal end 103 to a distal end 102 atong a longitiidinal axis A- A. The oral care implement 100 generally includes an elongated body 101 comprising a head 1 10, a neck 1 15 and a handle 120. The handle 120 is an elongated structure that piovides the me hanism by which the user can hold and manipulate the oral care implement 100 during use . The handle 120 comprises a front surface 124 and an opposing rear surface 125. In the exemplified embodiment, the handle 120 is gene rically depicted having various contours for user comfort. More spe ifically in the exemplified embodiment the handle 120 is bulbous shaped and has a larger diameter in a central region than near the proximal end 103 and neck 115. Specifically a region of the handle 120 that would normally be grippedbya user's thumb has a width that is greater than a width of the neck 1 15. Of course, the invention is not to be so limited in all embodiments and in certain other embodiments the handle 120 can take on a wide variety of shapes, contouE and configurations, none of which are kmiting of the present invention unless so specified in the claims.

[0020] In the exemplified embodiment, the handle 120 is formed of a rigid plastic material, such as for example without limitation polymers and copolymers of ethylene, propylene, butadiene, vinyl ompounds and polyesteis such as polyethylene teiephthalatB . Of course, the invention is not to be so limited in all embodiments and the handle 120 may include a resihent material, such as a thermoplastic elastomer, as a grip cover that is molded over portions of or the entirety of the handle 120 to enhance the gripabilit of the handle 120 during use. For example, portions of the handle 120 that are typically gripped by a user's palm during use may be overmolded with a thermoplastic elastomer or other resilient material to further increase comfort to a user.

[0021] The head 110 of the oral care imple ment 100 is couple d to the handle 1 0 and comprises a front surface 112 and an opposing rear surface 113. In the exemplified embodiment, the head 110 is formed integrally with the handle 120 as a single unitary structure using a molding, milling, machining or other suitable process. However, in other embodiments the handle 120 and the head 1 10 maybe formed as separate components which are operably connected at a later stage of the manufacturing pro ess by any suitable te hnique known in the art, including without limitation thermal or ultrasonic welding, a tight- fit assembly, a coupling sleeve, threaded engagement adhesion, or fasteneis.

[0022] In the exemplified embodiment, the head 1 10 of the oral care implement 100 is provided with a plurality of tooth cleaning elements 111 extending from the front surface 1 12. Although in the exemplified embodiment all of the tooth cleaning elements 111 appear to be the same, the invention is not to be so hmited in all embodiments. For example, in certain embodiments the tooth cleaning elements 1 1 1 include at least one bristle tuft comprising at least one spiral bristle . A single spiral bnstle is fonned by mteitwining two or more strand components or strands toge ther. whic h will be describe d in more detail belo w with re ferenc e to FIGS . 2-6. A bristle tuft is a collection of bustles that are positioned together into a single tuft hole formed on the head 110. Each bristle tuft may include, for example without limitation, only spiral bristles, a combination of spiral bristles and non-spiral bristles, or only non-spiral bristles. In certain embodiments, the oral care implement 100 may include one or more bristle tufts that include exactly one spiral bristle and other non-spiral bristles or one or more bristle tufts that include only spiral bristles. In still other embodiments, the tooth cleaning elements 111 may all be formed as bnstle tufts that aie formed solely of spiral bristles. Furthermore, in some embodiments the tooth cleaning elements 111 may include some bristle tufts that are formed solely of non-spiral bristl s and some bristle tufts that are formed solely of spiral bristles, and the non-spiral bristle tufts and spiial bristle tufts maybe positioned on the head 110 of the oral care implement 100 in an alternating or non-alte mating fashion (i.e., alternating or non-alternating tiansverse rows of bristle tufts).

[0023] Other than including at least one bristle tuft comprising at least one spiral bristle, the ex ct structure, pattern, orientation and material of the remainder of the tooth cleaning elements 111 is not to be limiting of the present invention unless so spec ifie d in the claims . Thus, as used here in, the term ¾oth c leaning e lements " is used in a gene ric sense to re fer to any structure that can be used to clean, polish or wipe the teeth and/or soft oral tissue (e.g. tongue, cheek, gums, etc.) through relative surface contact. Common examples of 'tooth cleaning elements" mclude, without limitation, bristle tufts, filament bristles, fiber bristles, nylon bristles, spiral bristles, rubber bristles, elastomeric protrusions, flexible polymer protrusions, combinations thereof and or structures containing such materials or combinations. Suitable elastomeric materials include any biocompatible resilient material suitable for uses in an oral hygiene apparatus. To provide optimum comfort as well as cleaning benefits, the elastomeric material of the tooth or soft tissue engaging elements has a hardness property in the range of A8 to A25 Shore hardness. One suitable elastomeric matenal is styrene-ethylene/butylene-styrene block copolymer (ΞΕΒΞ) manufactured by GLS Corporation. Nevertheless, ΞΕΒΞ mateiial from other manufacturers or other materials witiun and outside the noted hardness range could be used.

[0024] The tooth c aning elements 111 of the present invention can be connected to the head 110 in any manner known in the ait. For example, staples/anchors, in- mold tufting (ΙΙνΓΓ) or anchor free tufting (AFT) could be used to mount the cleaning elements/tooth engaging elements. In certain embodiments, the mvention can be practiced with various combinations of stapled, Πν Γ or AFT bristles. In AFT, a plate or membrane is secured to the brush head such as by ultrasonic welding. The bristles extend through the plate or membiane. The free ends of the bristles on one side of the plate or membrane perform the cleaning function. The ends of the bristles on the other side of the plate or membrane are melted together by he at to be anchored in place. Any suitable form of cleaning elements may be used in the broad practice of this invention. Alternativel the bristles could be mounted to tuft blocks or sections by extending through suitable openings in the tuft blocks so that the base of the bristles is mounted wil in or below the tuft block.

[0025] In the exemplified embodiment, the head 1 10 of the oral care implement 100 comprises a plurality of tuft holes (not visible) formed therein. A plurality of tufts of bristles are positioned within and affixed to the head 1 10 wil in each of the tuft holes. Each of the tufts of bristles includes a plurality of bristles, which can be single strand bristles, double strand spiral bristles, triple strand spiral bristles, etc . or various combinations thereof. Thus, one tuft of bristles may include one double strand spiral bristle and a plurality of single strand bristles or only double strand spiral bristles or only triple strand spiral bristles or a combination of single strand bristles, double strand spiral bristles and triple strand spiral bristles. Additionally a single tuft hole may be filled with an elastomeric cteaning element or any of the other types of cleaning elements noted above. As noted above, in one embodiment at least one bristle tuft includes at least one spiral bristle, which maybe a double, triple or otherwise strand spiral bristle . The details of the spiral bristle s will be disc ussed in more de tail below with referenc e to Figure s 2-6.

[0026] Although not illustrated herein, in certain embodiments the head 110 may also include a soft tissue cleanser coupled to or positioned on its rear surface 113. An example of a suitable soft tissue leans r that maybe used with the present invention and positioned on the rear surfa e of the head 1 10 is disclosed in U.S . Patent No. 7,143,462, issued December 5, 200ό ^" to the assignee of the pre se nt applic ation, the entirety of whic h is he reby incorporated by κ ferenc e . In certain other embodiments, the soft tissue cleanser may include protuberances, which can take the form of e longated ridge s, nubs, or c onitoinations the reof . Of course, the inve ntion is not to be so limited and in certain embodiments the oral care implement 100 may not include any soft tissue cleanser. [0027] Inferring now to Figure 2, a spiral bristle 200 is illustrated in accordance with an embodiment of the present invention. The spiral bristle 200 omprises a first strand component 210 and a second strand component 220 that are mterlwined together to form the spiral bristle 200. In the exemplified embodiment the fiist and second strand components 10, 220 wind around one another five nines apie e. However, the invention is not to be so limited and more or less spirals/ windings can be used to form the spiral bristle 200.

[0020] In the exemplified embodiment, the first and second strand components 210, 220 are c lindrical shaped strands, although the invention is not to be so limited and the first and second strand components 210, 220 can be any polygonal shape as will be discussed in more detail below with reference to FIGS 3 and 4. Furthermore, in certain embodiments one of the fust and second strand components 210, 220 may have grooves, ridges, pockets or recessed areas within which the other strand component is disposed when the fust and second strand components 210, 220 are irrtertwined together, as discussed in more detail below with reference to FIG. 7. In ce rtain embodiments, the first and second strand compone nts 210, 220 can be coextruded to form the spiral bristle 200. In such an embodiment, the spiral bristle 200 maybe consid red to be a monofilament. In other embodime ts, the first and second strand components 210, 220 can be extruded separately from one another and then later twisted together to form the spiral bristle 200. The act mann r of forming the spiral bristle 200 is not to be limiting of the present invention unless so specified in the claims.

[0029] Due to the nature of spiral bristle formation in that two or more strand components are interlwined together to form the spiral bristle, these strand components can be used to house, store or otherwise contain oral care additives including oral care agents. Each of the strand components that is used to form the spiral bristle can house the same oral caie additive, a different oral care additive, or only one of the two or more strand c omponents that forms a single spiral bristle can contain an oral care additive while the other of the two or more strand components maybe devoid of an oial care additive. Thus, in certain embodiments two or more oral care additives can be housed separately on different strand components of a single spiral bristle and can be made to intermix during use of the spiral bristle (or oral care implement on which the spiral bristle is disposed). Intermi ing of two or more oral care additives can b beneficial so that a chemical reaction occurs within a user's oral cavity and so that in some circumstances a third oral care additive or agent can be formed by the reaction of the first and second oral care additives within the user's oral cavity.

[0030] Rjeferring still to FIG. 2, in certain embodiments the first strand component 210 comprises a first plastic 211 and a first oral care additive 212 and the second strand component 220 comprises a second plastic 221 and a second oral care additive 222, the second oral care additive 222 being different than the first oral care additive 221 . In the exemplified embodiment, the first strand component 210 is illustrated as a lighter color than the se ond strand component 220 to schematically illustrate that each of the first and second strand components 210, 220 contains a different oral are additiv . Although described herein as the first and second strand components 210, 220 l aving different oral care additives, in certain embodiments each of the first and sec ond strand compone nts 210, 220 may have the same oral care additive , or one of the first and second strand components 210, 220 maybe devoid of an oral care additive while the other of the first and second strand components has an oral c are additive .

[0031] In certain embodiments, forming the first strand component 210 is achieved by melting the first plastic 21 1 and dispersing particles of the first oral care additive 212 within the melted first plastic 21 1 . The particles of the first oral care additive 212 are thereby mixed into the first plastic 21 1 so that the first strand component 210, when formed, will contain the first oral care additive 212. Similarly forming the second strand component 220 is a ieved by melting the second plastic 221 and dispersing particles of the second oral care additive 222 willun the melted second plastic 221 . The particles of the second oral care additive 222 are thereby mixed into the second plastic 221 so that the second strand component 220, when formed, will contain the second oral care additive 222. As noted above, the first and second oral care additives 212, 222 can be the same or different.

[0032] Upon cooling, the first and second melted plastics 21 1, 221 will become hardened and the first and second oral care additives 212, 222 will be housed, contained or dispersed within the respective first and second plastics 21 1, 221 . Next, in certain einbodiments the first and second plastics 21 1, 221 c an be coextiude d to form the spiral bristle 200 from the first and second strand components 210, 220. Alternatively the first plastic 21 1 with the first oral care additive 212 therein can be formed into the first strand component 210 and the second plastic 221 with the second oral care additive 222 the E in can be separately formed into the second strand component 220 (either by separate extrusion processes or any other bristle strand fonning process now known or la tier developed^, and then the first and second strand components 10. 220 can be twisted together to form the spiral bristle 200. In either se, the spiral bristle 200 is formed from the first and second strand components 210. 220. each of which contains a different (or the same) oral care additive or agent therein. Of course, as noted above one of the two strand components 210, 220 maybe formed without dispersing an oral care additive therein if desired.

[0033] In other embodime ts, the oral care additives need not be applied to the melted plastics in particle form. Rather, in other embodiments the oral care additives can be added to the respective strand components by forming the strand components with a tactile or sticky texture to hold the oral care additives thereon, or by forming the strand components with grooves, ledges, holes, hollows or other features and/or surface structure, shape or configuration that facilitates the housing of a powder, liquid, gel, paste or other form of oral care additive. Regardless of the manner of forming the spiral bristle s with oral c are additives therein, the oral care additives 212, 222 are releasable from the first and second plastics 21 1, 222 and from the first and second strand omponents 210, 220 of the spiral bristle 200, particularly during use of the oral care implement 100 as will be described in more detail below, in order to provide oral health benefits to a user.

[0034] Furthermore, in certain embodiments the oral care additives, in any form (i.e., particle, powder, liquid, gel, paste etc.), maybe embedded or housed within or otherwise carried by one or more carriers which are then formed into, housed or contained witiun the first and second strand components 210, 220. Specifically the first oral care additive 21 2 maybe carried by a first carrier and the second oral care additive 222 maybe carried by a second carrier. In one embodiment each of the first and second carriers maybe one or more water-soluble polymers. In such an embodiment t e oral care additives 212, 222 maybe carried by disposed within or embedded within the one or more water-soluble polymeis, and then the water-soluble polymers can be added to the melted plastic that is used to form the first and second strand components 210, 220 as de sc ribed above . In this manner, the carriers will be mixed or formed into the plastic material that forms the first and second strand components 210, 220, the carriers carrying the oral care additives. In such embodiments, it maybe desirable for the fiist carrier to have a higher melting point than the melting point of the first plastic 211 and for the second carrier to have a higher melting point than the melting point of the second plastic 221 so that the carrier or water- soluble polymer maintains its structure and retains the oral care additive therein when being adde d to the melted plastic . As the plastic cools and hardens, the c arrie rs may then be containe d or dispersed within the plastic as the plastic is formed into the individual strand compon nts.

[0035] In certain embodiments, each of the first and second carriers can comprise one or more degradable or dissolvable capsules that carry, contain or encapsulate the first and second oral care additives 1 , 222 therein. The capsules maybe soluble in liquid, sue h as saliva, to release the oral care additives 212, 222 contained therein during use of the oral care implement 100. Stated another way, the capsules degrade when subject to moisture and thus dissolve when mined with the saliva of the user to release its contents. Alternatively the capsules may have frangible, thin walls that bieak, rupture or burst to release the oral care additives 212, 222 contained therein during use due to being contacted by or rubbed against the user's teeth. In other embodiments, each of the first and second carriers can comprise one or more matrices that carry the first and second oral care additives 212, 222. Similar to the capsules, the matrices may also dissolve or break to release the oral care additives 212, 222 contained therein during use of the oral care implement 100. In other embodim nts, one of the first and se ond rriers can comprise one or more capsules carrying the first oral care additive and the other of the first and second carriers can comprise one or more matrices carryng the second oral care additive, or each of the fiist and second carriers may comprise a combination of capsules and matrices that carry the respective oral care additives.

[0036] Using the carriers to house the oral care additives may assist in erisuring that the oral care additives are properly retained on the strand components and released into a user's oral cavity during use of the oral care implement 100. Specifically in embodiments wherein the carriers are water-soluble polymers, such carriers/water-soluble polymers will degrade, shrink or dissolve in the user's sakva during use of the oral care implement, there y releasing the oral care additives from the carriers and into a user's oral cavity. The solubility of such water-soluble polymers can be sele ted as desired to create a spiral bristle having immediate release of all of the oral care additives c ontained the rein or a timed release of the oral c are additives contained therein.

[0037] In certain embodiments the first and/or second carriers maybe formed for timed or slow release of the oral care additives contained therein so that the benefits of the oral care additives can be obtaine d by the user over many uses of the oral c are imple ment 100. In one embodime nt_ the carriers may degrade over a period of three months so that upon the entire oral care additive having been released into the user's oral cavity during brushing, the user will know that it is time to replace the toothbrush. In certain en±iodiments, the strand components of the spiral bristle 200 may change color upon the oral care additive contained therein being depleted to visually communicate to a user that toothbrush replacement is needed. Thus, the spiral bristles 200 can serve as both oral c are additive containment/ dispensing structure s and as a wear indicator.

[0038] In other embodiments, the first strand component 210 may include first carriers (i.e ., water-soluble polymers) that degrade or dissolve within a first temporal period of time and the second strand component 220 may include second carriers (water-soluble polymers) that degrade or dissolve within a second temporal period of time so that the oral care additives within the second carriers do not begin to be re lease d until the entirety of the oral care additives within the first carriers have been released. Thus, the second carriers will not begin to dissolve until the entirety of the first c ame rs has dissolved, sue h that the first c amers will have a higher soliinlity than the second carriers. In oth r en iodiments, the first and/or second carriers may completely erode, de rade, shrink or dissolve during a first use so that the entirety of the oral care additives contained therein is released into the user's oral cavity during a single use. In such embodiments, the oral care implement 100 maybe a disposable or single use toothbrush.

[0039] The first and se ond oral care additives 21 1, 221 can be any of a variety of oral care additives that provide proven benefits to a user's oral he lth. Such oral care additives include, without limitation, lotus seed; lotus flower, bamboo salt; jasmine; com mint; camellia; aloe ; gingko; tea tree oil; xjiitol; se salt; vitamin C; ginger; cactus; baking soda; pine tree salt; green tea; white pearl; black pearl; charcoal powder; nephrite or jade and Ag/Au+. The lotus seed is the extract from lotus seeds and is a natural herb for anti-heating and the prevention of gum bleeding. The lotus flower is the extract from the lotus flower and is a natural herb for anti- heating and the prevention of gum bleeding. Bamboo salt is the combination of a bamboo extract and salt and is used to diminish inflammation and has anti -bacterial effects. Jasmine is an extract from the jasmine flower and is a natural herb for anti-heating, prev nting gum bleeding and for mouth freshening. Com mint is an extract from a com mint leaf and is a ratural herb for anti- heating, anti-ba terial uses and mouth fastening. Camellia is an extract from the camellia flower and is a natural herb for anti- heating and the prevention of gum bleeding. Abe is an extract from the aloe leaf and is a natural herb for inflammation reduction and has anti -bacterial effects. Gingko is an extract from the gingko leaf and is a natural herb for inflammation reduction and has anti-bacterial effects. Tea tree oil is an extract from a tea tree and is a natural herb for diminishing inflammation and has anti-bacterial effects. Xylitol is an extract from plants such as com, sugar cane, oak. birc h, etc . and c an be used for preve nting tooth decay. S salt is an extract from the sea and can be used to reduce inflammation and has anti -bacterial effects. Vitamin C is an extract from food and can be used to prevent gum bleeding and as an antioxidant. Ginger is an extract from ginger and is a natural plant for dimirdshing inflammation and has anti-bacterial effects. Cactus is an extract from a cactus and it a natural plant for reducing inflammation and can be used as an antiox idant . Backing soda is a chemistry product and can be used as an enamel protectant. Fine tre e salt is a mix tune of the ex tract from pine tre es and salt and is an ancient Chin se medicine for preventing inflammation and anti- eating. Gree tea is an extract from the green tea leaf and is a natural herb to prevent halitosis and inhibit bacteria growth. White pearl is a kind of pearl powder and can be used for teeth whitening and teeth health improvement by calcium absorption. Black pearl is a kind of pearl powder that can be used for teeth whitening, cleaning and stain removal. Charcoal is made from an oak tree by carbonisation and it helps to for moisture adjustment and to reduce the growth of bacteria. Nephrite (jade) is a kind of nephrite powder and can be used to prevent gum disease and boost the blood circulation of the gums. Ag/Au is an anti-bacterial additive contained in the Ag/Au ion (i.e ., silver/gold) and can be used to inhibit bacterial growth. In certain embodiments, each of the first and second oral care additives are selected from a group consisting of a mixture of pine tiee extract and sail, a tea leaf extract a pearl powder, a nephrite powder, a charcoal powder, and an antibacterial material. In some e n^odiments, the oral care additives are natural ingredients.

[0040] In certain embodiments, each of the first and second strand components 10, 220 may have a different color to provide both a visual aesthetic and to communi ate information about the oral care additive contained on that particular strand component to a user. Thus, for example, a spiral bristle may include a first strand component that contains an orange flavored oral care additive and a se ond strand omponent that contains a lemon flavored oral care additive. In such an embodiment, the first strand component maybe orange in color and the second strand component ma be yellow in cobr to visually communicate their respective flavors to a user. Similarly, a spiral bristle may include a first strand c omponent that has a green tea extract and a second strand component that includes black pearl. In such an en^odiment, the first strand component maybe green in color and the second strand component maybe black in cobr to visually communicate their respective oral care additives to a user. Similarly, the color blue can be used to inform a user that a particular strand component will provide a cooling trigeminal effect to the user, the color red can be used to inform a user that a particular strand component contains an oral care additive that will boost blood circulation, the cobr purple can be used to inform a user that a partic ular strand compone t contains an anti- inflammatory oral care additive, etc. Cobr-coding the strand components of the spiral bristles provides a desirable visual aesthetic as well as being informative for the user or consumer. The oral care implement on which the spiral bristles are contained may include a cobr-coded key on its handle, head, packaging or on a separate instruction information sheet that is provided with the oral care implement to inform the user of the message that the various colored strand components are intended to convey

[0041] In certain en^odiments, any of one or more of the above oral care additives can be included into each of the first and second strand components 10, 220 that are used to form the spiral bristle 200. However, in c rtain embodiments one of the above oral care additives is included into the first strand component 210 and a se ond one of the above oral care additives is included into the second strand component 220, the second one of the above oral care additives being different than the first one of the above oral care additives. In certain embodiments, the first and second oral care additives may each have an agent that is selected so that during birahing the agents of the first and second oral care additives mix together to form a i td oral care additive or agent. Specifically, prior to birushing the first oral care additive will remain chemically isolated from the second oral care additive despite the first and second oral care additives being on the same spiral bristle 200 because the fust oral care additive is formed into or carried by the first strand component 210 and the second oral care additive is formed into or carried by the second strand component 220. During brushing, the first and second strand components 210, 220 will get wet which enables the first oral care additive 212 (or a portion thereof) to be re lease d from the first strand c omponent 210 and the sec ond oral care additive 222 (or a portion thereof) to be released from the second strand component 220. When the fust and second oral care additives 212, 222 are simultaneously released, the agents within those oral care additives may intermix wit in the user's oral cavity to form a third agent in some embodiments.

[0042] Intenttixing of the first and second oral care additives within the user's oral cavity can be beneficial in certain instances. Specifically, certain agents, medicaments, anesthetics, antimicrobial agents, polishes, white ners and other misc llaneous agents, substances and chemicals lose effectiveness over time . Thus, it may be desirable to apply such substances substantially immediately after their formation. Using the strand components 210. 220 of the spiral bristle 200 as the structures on which the oral care additives are housed facilitates this intermixing within the user's oral cavity.

[0043] As note d above , the two oral care additives c an b e selected so that the y form a third oral care additive or agent upon mtermixing within a user's oral cavity. Some reactions that maybe used include: (1) mixing a base with an acid to form a neutral; (2) mixing a base with a curing agent to form an epoxyresin; (3) mixing Bisphenol F with Epichchlorhydin to form diglycidyl ether of bisphenoal A (epoxy resin); (4) mixing calcium carbonate with hydrogen peroxide to form peroxide ; (5) mixing water with hydrogen pe roxide to form peroxide; (6) mixing potassium nitrate with stannous fluoride to form a s nsitivity agent; (7) mixing chlorhjexadine with silica to form an antimicrobial agent; (8) mixing cetylpyridinium chloride with silica to form an antimicrobial agent; (9) mixing tricolsan with pyrophosphate to form an antimicrobial ag nt; and (10) mixing a first flavor with a se ond flavor to form a third flavor. Thus, various oral care additives/ agents can be formed that are known for tooth whitening, cleaning, antimicrobial, antibacterial, taste or other desired effects.

[0044] As noted above, the first strand component 210 is formed of the first plastic 21 1 and the second strand c omponent 220 is formed of the sec ond plastic 221 . In ce rtain embodime nts, eac h of the first and second plastics 211, 221 is the same . In such en^odiments, both of the first and second plastics 21 1, 221 may be e lodible by an etc hant or neither of the first and second plastics 211, 221 maybe erodible by the etchant. However, in other embodiments the first and second plastics 21 1, 221 are different. In one particular embodiment the first plastic 211 is eiodible by an et hant and the sec ond plastic 221 is chemi ally resistant by the etchant. Furthermore, in one embodiment the first plastic 211 is a polyester, such as polyoutylene ter hthalate (PBT), and the second plastic 221 is a polyamide, such as nylon. Of course, the invention is not to be limited by the particular materials that are used to form the first and second strand components 10, 220 unless so specified in the claims.

[0045] Referring now to FIGS . 3 and 4, a first strand component 310 and a second strand component 320 are illustrated as se arate structures that have not been mtertwined to form a spiral bristle. Thus, FIG. 3 does not illustrate a spiral bristle, but rather just the strand components 310, 320 that can be intertwined together to form a spiral bristle. In this embodiment each of the fust and se cond strand c omponents 310, 320 has a hexagonal transve rse cross-sectional shape. Of course, as discussed above the invention is not to be so limited and the first and second strand components 310, 320 can take on any polygonal shape as desired. The first and second strand components 310, 320 may have the same polygonal shape in some embodiments and may ea h have a different polygonal shape in other embodim nts.

[0046] Referring to FIGS . 5 A and 5B, schematic illustrations are provided for spiral bristles. Specifically FIG. 5 A depicts a spiral bristle 500 (the spirals of whi h are not illustrated for clarity) having a first end 501 and a free end 502. The free end 502 of the spiral bristle 500 is rounded. FIG. 5B depi ts a spiral bristle 600 (the spirals of which are not illustrated for clarity) having a first end 601 and a free end 602. The free end 602 of the spiral bristle 600 is tapered. Specifically the spiral bristle 600 has a conical end portion 603 which includes the free end 602 and that decreases in transverse cross-sectional area inoving toward the free end 602 of the spiral bristle 600. In the exemplified embodiment the spiral bristle 600 begins to taper at a distance from the first end 601 that is approximately one-third of the height of the spiral bristle 600, and the free end 602 of the spiral bristle 600 is pointed rather than rounded. The exact nature, degr , amount and location of the taper is not to be limiting of the present invention unless so specified in the claims. Either one or both of the spiral bristles 500, 600 can be used on the oral care implement 100 described above so that the spiral bristles can be rounded or tapered to achieve a desired cleaning result and mouth feel. The spiral bristles 500, 600 having rounded and tapered free ends 502, 602, respectively can be used as a part of the same tuft of bristles or different tufts of bristles on the same toothbrush head if desired.

[0047] In certain e n iodiments, the spiral bristle 600 having the tapered free end 602 can be formed by forming the fiist and second strand components of the spiral bristle 600 out of a plastic that is erodible by an etchant. In such en iodiments, a chemical tapering process can be used to taper the spiral bristle 600 which includes dipping the spiral bristle 600 into an etchant to erode portions of the first and second strand components to taper the conical end portion 603 of the spiral bristle 600. Such a process leads to a conically tapering spiral bristle . In other embodiments, only one of the strand components may be formed of a plastic material that is erodible by an etchant and the other one of the strand components maybe chemically resistant against the etchant. In such an embodiment the first strand component will erode and taper when dipped into an etchant and the second strand component will maintain its structure when dipped into the etchant. This can create a single spiral bristle that has one tapered strand component and one non- tapered strand omponent. This can be accomplished by forming the first strand component out of a polyester such as PBT and forming the second strand component out of a polydmide such as nylon, as described above. Although the tapering is described above as a chemical tapering, the invention is not to be so limited. In other embodiments, the spiral bristle o ^" 00 can be mechanically tapered by any means known in the art.

[0048] Inferring now to FIG. 6, a spiral bristle 700 in accordance with another embodiment of the present invention will be described. The spiral bristle 700 comprises a first strand component 710, a second strand component 720 and a thitd strand component 730 that are mtertwined together to form the spiral bristle 700. In certain embodiments, each of the first, second and third strand components 710, 720, 730 can be co xtrud d and intertwined together to form the spiral bristle 700. The first strand component 710 can include a first plastic 711 and a first oral care additive 712, the second strand component 720 can include a second plastic 721 and a second oral care additive 722, and the third strand component 730 can include a third plastic 731 and a third oral care additive 732. In certam embodiments, the third oral care additive 732 maybe different than the first and second oral care additives 712, 722, which are also differe t from each other. Thus, the spiral bristle 700 may include three different oral care additives to provide thiee different benefits to a user. Of course, the invention is not to be so limited in all embodiments and in certain other embodiments one or more of the oral care additives on the diff rent strand components can be the same, or one or more of the strand components maybe devoid of an oral care additive. Each of the first, second and tlmd strand components 710, 720, 730 can be forme d in the manne r described above with regard to the spiral bristle 200.

[0049] Although not depicted, spiral bristles can also be formed having more than three strand components (i.e ., four, five, six or more strand components), each of which has a different oral care additive or any ombination of the same and different oral care additives. Thus, using the inventive spiral bristles described herein, an oral care implement can be created that can dispense/rel se many diffe rent oral care additives into a user's oral vity simultaneously. A combination of different two strand component (or more strand component) spiral bristles can be utilised on the same oral care implement head wherein each strand component has different oral care agents. For example, an oral care impleme nt may include tooth cleaning elements disposed in transverse rows on the h ad. Each transverse row may include bristle tufts including spiral bristles such that the spiral bristles in one transverse row include different oral care additives than the spiral bristles in each other or each adjac nt transverse row. A virtually un nrited number of different combinations of the spiral bristles described herein are possible.

[0050] Inferring now to FIG. 7, another embodiment of a spiral bristle 800 is illustrated. The spiral bristle 800 has a first strand compone nt 810 and a sec ond strand component 820. Each of the first and second strand components 810, 820 are illustrated in different grayscale to illustrate that each of the first and second strand components 810, 820 can have different oral care additives therein. The oral care additive can be dispersed within the first and second strand components 810, 820 of the spiral bristle 800 in any of the manners dis ussed above. In this embodiment the spiral bristle 800 has a smooth continuous outer surface 803 despite being formed by two separate strand components 810, 820. Spe ifically, the first strand component 810 is formed with a recess 815 within which the se ond strand component 820 fits tike a lock- and-k y. Thus, the first and second strand components 810, 820 are complementarily shaped so that when coextruded or otherwise made to form the spiral bristle 800, the spiial bristle 800 has the smooth outer surface 815. Stated another way, the seams 816 between the first and second strand components 810, 820 are flush so that there are no bumps, ridges or the like at the region of interconnection between the first and second strand components 810, 820. This is achieved due to the omplementary shapes of the first and second strand components 810, 820 and canbe ac ieved by coextniding the first and second strand components 810, 820 to form the spiral bristle 800 in certain en^odiments. Although illustrated as having a constant exterior diameter, in certain embodiments the spiral bristle 800 may be tapered such that the exterior diameter dec reases from its base 801 to its tip 802, such as disc ussed above with re ferenc e to FIG. 5 B.

[0051] In certain embodiments, various combinations of the different t;?pes of spiral bristles discussed above can be used on a single toothbrush head. Thus, screw- type spiral bristles comprising two strand components such as depicted in FIG. 2, screw-tjipe spiral bristles comprising three strand components such as depicted in FIG. 6, and smooth surface spiral bristles such as depicted in FIG. 7 can be disposed on the same toothbrush head, either in the same tuft hole or in different tuft holes. Thus, various combinations of the different embodiments disclosed he rein c an be utilised in a single invention.

[0052] Furthermore, although the invention has been described herein with regard to an oral care implement having at least one bristle tuft having at least one spiral bristle, in certain embodiments the inventive concept described herein is the spiral bristle itself. Thus, the invention can simply be a spiral bristle including coextruded first and second strand components that are mteriwin d tog ther wherein the first strand component comprises a first plastic and a first oral care additive and the second strand component compris s a second plastic and a second oral care additive, the second oral care additive being different than the first oral care additive.

[0053] As used throughout ranges are used as shorthand for describing each and every value that is within the range. Any value within the range can be selected as the terminus of the range . In addition, all references cited herein are hereby incorporated by referenced in their entireties. In the eve nt of a conflict in a definition in the present discbsure and that of a cited re ferenc e, the present discbsure controls.

[0054] While the invention has been described with respect to specific e amples including presently preferred modes of carrying out the invention, those skilled in the art will appreciate that there are numerous variatbns and permutations of the above described systems and techniques. It is to be understood that other embodiments maybe utilized and structural and functbnal modificat ns maybe made without departing from the scope of the present invention. Thus, the spirit and scope of the inventbn should be construed broadly as set forth in the appended claims.