| 摘要 |
Provided is a tooth whitener that is excellent in immediate effectivity of a gloss imparting effect on teeth and a tooth whitening effect. A tooth whitener which is provided with a composition (A) and a composition (B) in a separate state and which is to be used by applying the composition (A) and the composition (B) alternately to teeth, wherein the composition (A) comprises 0.1% by mass or more and 30% by mass or less of phytic acid or a salt thereof in terms of the acid, does not comprise any polyvalent metal cation, or alternatively comprises such cations in an amount of less than 0.1-fold mol relative to phytic acid or the salt thereof, exhibits a pH of 4 or more and 6.5 or less at 25° C., and comprises a fluoride in an amount such that the mass ratio of the fluoride in terms of fluorine atoms to the phytic acid in terms of the acid (the fluoride in terms of fluorine atoms/phytic acid) is 0.05 or less, or alternatively does not comprise any fluoride; and the composition (B) comprises one or more selected from orthophosphoric acid, condensed phosphoric acid and salts thereof in an amount of 0.01% by mass or more and 15% by mass or less in terms of the acid and exhibits a pH of more than 6.5 and 10.5 or less at 25° C. |
