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How often?
多久刷一次牙？
"The best way to prevent tooth decay is to brush teeth twice daily with a fluoride toothpaste to remove plaque, limit the frequency, and amount of sugary food and drinks consumed in your diet, and see the dentist regularly.
“预防蛀牙的最好办法就是一天用含氟牙膏刷两次牙，因为含氟的牙膏可以帮助去除牙菌斑，除此以外还需要控制含糖饮食的次数和摄入量，并定期看牙医。”
Don'ts
该避免的事：
1. Brush for long enough – research indicates that people only brush for 45 seconds
1. 刷牙时间不要太短。研究发现很多人刷牙只刷45秒左右。
2. Rinse the mouth after brushing – fluoride helps to prevent, control and even stop tooth decay – but rinsing the mouth out dilutes the concentration of fluoride, so SPIT, don’t rinse.
2. 刷牙后不要使劲漱口。氟化物能预防、控制甚至让龋洞停止进一步发展，但使劲漱口会稀释氟化物，所以直接吐出来就好了。
3. Brush too soon after eating – as enamel on teeth is softened after eating especially with sugary foods – it’s best to wait an hour before brushing which allows the tooth to harden up more.
3. 进食后切勿立马刷牙。进食后——尤其是吃了甜食后——牙釉质会软化，所以最好过一个小时等待牙釉质恢复后再刷牙。
4. Use a hard bristle toothbrush as this can damage the soft tissues in the gums.
4. 别用硬毛牙刷。硬毛牙刷会伤害牙龈组织。
5. Don't brush too hard – the bristles should lightly sweep the tooth.
5. 刷牙不要太使劲。刷毛应该轻轻扫过牙齿。
