To provide a method by which a toothbrush can be effectively used in the initial state for a long period time by restoring the polishing and cleaning effect by correcting the bend of bristles by a consumer oneself simultaneously with sterilization because bristle tips of the toothbrush are bent by the use for a few months, the bristle tips can be seen from the back side of the implanting base table, and the polishing and cleaning effect is deteriorated.

A shape arranging tool used also as a fittable cap is added as an accessory when selling the toothbrush, the toothbrush head whose bristle tip are bent after using few weeks is covered with the cap used also as the cap and is boiled 10 sec to 20 sec. Further, in the toothbrush polishing teeth while sandwiching a tooth row with inclination in the outside row which is hardly manufactured up to now, implanting holes are vertically arranged in parting lines, bristle are implanted short in a center row hole and long in outside row holes, thereafter the present method is used, thereby the toothbrush polishing teeth while sandwiching a tooth row with inwardly inclination in the outside row can be easily obtained.