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

最初引起注意是， 人们牙齿上出现了棕色污渍，种现象现在被称为氟斑牙。

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

CDC 一建议完全基于在预防牙和限制牙齿氟斑病风取得平衡剂量。

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.

但是过多氟化物，尤其是对于儿童来说，成年人牙齿还在形成阶段，当牙齿上形成白色斑块时，就会导致一种叫做氟斑牙问题。