To obtain a tooth bleaching agent useful in the field of cosmetic dentistry, with which a bleaching treatment of tooth can be finished in a short time and which has a slight influence on and irritation of gingiva and other oral mucosas.
This tooth bleaching agent comprises a water absorption polymer-containing hydrous gel and a bleaching agent component. The water absorption polymer is a polyacrylate. Generally the tooth bleaching agent is constituted of a two-pack type bleaching agent composed of an agent A comprising a polyacrylate-containing hydrous gel and an agent B of a solution containing the bleaching agent component. Preferably a starch/acrylate graft polymer is used as the water absorption polymer and hydrogen peroxide, urea peroxide, sulfur dioxide, etc., are used as the other bleaching agent component.
KAWAHARA MASARU
NAKAI HIROMASA
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