Question

why does tooth decay start

Answer 1

Answer:

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.

Answer 2

Tooth decay causes enamel and dentine to gradually weaken. It begins when acids are formed by bacteria acting on sugars that soften or demineralize the enamel. Bacteria in the mouth create acids after eating through the oxidation of sugar and food particles in the mouth.