Question

Why does tooth decay start when pH of mouth is lower than 5.5?

Answer 1

Why does tooth decay start when thepH of mouth is lower than 5.5? 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 mouthafter eating.

Answer 2

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.