本文对含乳酸及其盐类的口腔卫生品如牙膏减少龋齿和清洁口腔作了介绍。
The effect of oral hygiene products like toothpaste containing lactic acid and its salts on reducing cavities and freshening breath is related in this paper.
污渍太重时，可使用纯棉软布蘸中性清洗剂：如牙膏（非磨砂类）、肥皂水擦拭。
Please using soft-cotton fabric with neutral cleaning solvent such as toothpaste (non-matte type) or suds to wiping door surface when besmirch heavily.
先是希腊人，然后是罗马人，将牙膏的配方加以改进。他们添加了一些磨料如碎骨和牡蛎壳，用来清除牙齿上的污垢。
The Greeks, and then the Romans, improved the recipes for toothpaste by adding abrasives such as crushed bones and oyster shells, which were used to clean debris from teeth.
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