What is tooth enamel chemically ? State the condition when it starts corroding. What happens when food particles left in the mouth after eating degrades ? Why do doctor suggest the use of tooth powder/tooth paste to prevent tooth decay ?

Explanation

White tooth enamel is calcium phosphate and a very hard substance, which gets affected when pH of our mouth falls below 5.5.
It happens because bacteria present in our mouth breakdown sugar and food particles into acids which damage our teeth by corroding them. To prevent tooth decay, after eating one should clean mouth thoroughly with tooth power or tooth paste, which is basic in nature. It nuetralises the excess of acid produced in the mouth.