彻底清洗来消除肥皂的所有痕迹。
每几个月换一个新的，并在使用后进行彻底清洗。
Get a new one every few months, and rinse thoroughly after using.
523名学生在吃饭后十分钟内刷牙。如果情况允许的话，他们会使用牙刷；否则，他们会用水彻底清洗口腔。
523 students cleaned their teeth within ten minutes of eating when possible they used a toothbrush, when this was impossible they washed their mouth thoroughly with water.
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