氟化物内含有坚固牙齿表面，抑制蛀牙或牙斑形成的珐琅。

The fluoride mixes with enamel, the hard surface on teeth, to help prevent holes, or cavities, from forming.

youdao

氟化物内含有坚固牙齿表面，抑制蛀牙或牙斑形成的珐琅。

The fluoride mixes with enamel, the hard surface on teeth, to help prevent holes, or cavities, from forming.

youdao