Question

Which chemical is added to many municipal water supplies to prevent tooth decay

Answer 1

Fluorine.

Fluorine is a chemical used in toothpastes to prevent tooth decay and improve the condition of the teeth.
It can also be used in water to prevent decay.

Answer 2

Sodium fluoride is a chemical that is added in many municipal water supplies to prevent tooth decay. You can even find it in your toothpaste if you look at the ingredients. Sodium fluoride is a very safe and effective chemical used in lots of oral products because of its benefits against tooth decay. Hope this helps!