But too much fluoride, especially for children who's adult teeth are still forming can lead to a problem called dental fluorosis when white patches form on teeth.

但是过多的化物，尤其是对于儿童来说，成年人的牙齿还在形成，牙齿上形成白色时，就会导致一种叫牙的问题。

This CDC recommendation is solely based on an amount that balances the protection from tooth decay while limiting the risk of dental fluorosis.

CDC 的这一建议完全基于在预防蛀牙和限制牙齿病风险之间取得平衡的剂量。

Initially, what was noticed was that people had brown staining on their teeth, which is now called dental fluorosis.

最初引起注意的是， 人们牙齿上出现了棕色污渍，这种现象现在被称为牙。