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Benjamin Gonzales——Works at the World Health Organization, Lives in Geneva, Switzerland.
Cavities take time to form. A person doesn't just get a cavity overnight. It typically takes months, or possibly even years, before the decay process has advanced to a point where it requires attention. (That's why your dentist feels comfortable enough only examining you every
6 months.)
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About “6 months、6 months、6 months”,people ask:
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