Question

Why does tooth decay start when the ph of mouth is lower than5.5

Answer 1

When the pH in the mouth falls below 5.5, tooth decay starts. Bacteria present in the mouth produce acid by degradation of sugar and food particles which remain in the mouth after eating. The acid produced in the mouth attack the enamel thereby, creating tooth decay.
Hope it helps!!

Answer 2

1) Tooth decay starts when the pH of the mouth is lower than 5.5.

2) Tooth enamel, made of calcium phosphate is the hardest substance in the body.

3) It does not dissolve in water, but is corroded when the pH in the mouth is below 5.5.

4) Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth.

Preventions :

1) Clean the mouth after eating food.

2) Using tooth pastes, which are generally basic neutralize the excess acid and pre-

vent tooth decay.