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.歯への光沢付与効果及び歯の美白効果の即効性に優れた歯牙美白剤を提供する。 次の組成物(A)並びに組成物(B): 組成物(A)フィチン酸又はその塩を酸換算量で0.1質量%以上30質量%以下含有し、かつ多価金属カチオンを含有しないか或いはフィチン酸又はその塩に対して0.1倍モル未満含有し、25℃におけるpHが4以上6.5以下であり、かつフッ化物をフッ素原子換算量でフィチン酸の酸換算量との質量比(フッ素原子換算量/フィチン酸)が0.05以下となる量で含有するか、又はフッ化物を含有しない組成物、並びに 組成物(B)オルトリン酸、縮合リン酸及びこれらの塩から選ばれる1種又は2種以上を酸換算量で0.01質量%以上15質量%以下含有し、25℃におけるpHが6.5より大きく10.5以下である組成物を分離して備え、組成物(A)及び組成物(B)を交互に歯に適用するための歯牙美白剤。
