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， 人们出现了棕色污渍，这种现象现在被称为斑。

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和限制斑病风险之间取得平衡的剂量。

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，尤其是对于儿童来说，成年人的还在形成阶段，当形成白色斑块时，就会导致一种叫做斑的问题。