不含氟的全效牙膏也许有助于预防牙龈疾病,但不能预防蛀牙。
9. Hard toothbrushes
牙刷太硬
Hard toothbrushes can cause excessive wear and recession of the gums.
刷毛硬的牙刷会引起牙龈过度磨损和萎缩。
10. Brushing your teeth for 45 seconds
只刷45秒
Surveys show that as many 43 percent of patients brush their teeth for just 45 seconds.
调查显示,多达43%的牙病患者刷牙只刷45秒。
This is not long enough to give them a proper clean.
这个时间太短,不足以做充分的清洁。
You should clean your teeth for at least two minutes.
你的刷牙时间应该至少是两分钟。
Vocabulary
floss: 牙线
bristle: 短而硬的毛
abrasive: 有研磨作用的
bicarbonate: 碳酸氢盐
enamel: (牙齿的)釉质
amber: 黄褐色,琥珀色
dentine: 牙质
swish: 嗖嗖地快速移动
fluoride: 氟化物
tooth decay: 蛀牙
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