PROBLEM TO BE SOLVED: To provide a tooth bleaching composition that can whiten teeth efficiently, that is, in a short time, without demineralizing teeth, and to provide a tooth bleaching method for aesthetics using the bleaching composition.SOLUTION: A tooth bleaching is performed using a tooth bleaching composition comprising a bleach precursor (I) comprising chlorous acid (salt), as well as an acidifying agent (II), and a neutralizing agent (III), each of which may contain water, and also comprising a liquid agent (IV) for preparing aqueous liquid when both the bleach precursor (I) and the acidifying agent (II) do not contain water, a mixture A1 of the bleach precursor (I) and the acidifying agent (II) or a mixture A2 of the bleach precursor (I) and the acidifying agent (II) and the liquid agent (IV) for preparing aqueous liquid indicating a pH of 1.5 to 5.0, and a mixture B obtained by adding the neutralizing agent (III) to the mixture A1 or A2 indicating a pH of 4.0 to 8.0.SELECTED DRAWING: Figure 9COPYRIGHT: (C)2020,JPO&INPIT【課題】本発明の目的は、歯を脱灰することなく、高効率で、即ち、短時間で歯のホワイトニングを実施できる歯の漂白用組成物及びその漂白用組成物を用いる美容用の歯の漂白方法を提供することにある。【解決手段】亜塩素酸（塩）を含む漂白剤前駆体（Ｉ）、酸性化剤（ＩＩ）及び中和用剤（ＩＩＩ）を含み、これらの各々は水を含有するものであってもよく、漂白剤前駆体（Ｉ）と酸性化剤（ＩＩ）の両者が水を含有しない場合は、水性液体調製用液剤（ＩＶ）をも含み、漂白剤前駆体（Ｉ）と酸性化剤（ＩＩ）との混合物Ａ１又は漂白剤前駆体（Ｉ）と酸性化剤（ＩＩ）と水性液体調製用液剤（ＩＶ）との混合物Ａ２は、１．５乃至５．０のｐＨを示し、混合物Ａ１又はＡ２に中和用剤（ＩＩＩ）を添加して得られる混合物Ｂは、４．０乃至８．０のｐＨを示す歯の漂白用組成物を使用して、歯の漂白を行う。【選択図】図９
