They suggest limiting the length of tooth-brushing to two minutes and a force of 150 grams.

研究人员建议，刷牙的时间应该是两分钟，力度应在150克左右。

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Well, actually, our obsessive-compulsive tooth-brushing practices lead to deteriorating oral health, including increased Numbers of cavities and eventual tooth loss.

其实每天的强迫性刷牙会损害口腔健康，造成蛀牙增多和牙齿脱落。

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Tooth brushing became popular during the World War I.

第一次世界大战期间，刷牙开始流行起来。

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At the same time, Scotland's chief dentist urged parents to ensure their children stuck to a good tooth-brushing routine.

BBC: Scottish children's teeth 'best on record'

Creating routines or even rituals around our work helps in the same way making a routine out of tooth-brushing or taking daily walks helps in everyday living.

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