每个人需要每天用含氟牙膏。
每天至少用含氟牙膏刷牙两次，每次刷两分钟。
Brush for at least two minutes, twice daily, with a fluoridated toothpaste.
大多数牙膏含氟，氟是可以防龋的。
Most toothpastes contain fluoride, which has been proven to prevent cavities.
大多数牙膏含氟，氟是可以防龋的。
Most toothpastes contain fluoride, which has been proven to prevent cavities.
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