Question

why toothpaste are used to prevent tooth decay

Answer 1

Explanation:

Fluoride is a very safe and effective way to help prevent tooth decay, so is an important ingredient in toothpaste and mouthwashes. It works by making the enamel (that's the tooth's hard outer surface) more resistant to acids produced by the bacteria living on the teeth and gums.

Answer 2

Toothpastes are basic in nature. They neutralize the acid formed in mouth which causes tooth decay.