| 摘要 |
A tooth-paste comprising an addition of a coloring agent and of areducing agent for decoloring said tooth-paste under the effect of the brushing, wherein said tooth-paste is made of a fluorine-based toothpaste, and includes methylene blue in a proportion of about 500 .mu.l to 1 ml, in a 1 mg/ml solution, for 5 g of tooth-paste, that is a proportion of the order of 0.125 to 0.250 .mu.M per gram of tooth-paste, and a reducing agent constituted by sodium ascorbate in powder form which is added at the moment of use.
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