Question

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

Answer 1

1. Tooth enamel is made of calcium phosphate, which is the hardest material in our body and does not dissolve in water.
2. When we eat, bacteria present in the mouth degrade sugar and food particles to produce acids.
3. If the pH in the mouth falls below 5.5, this acid becomes strong enough to attack and corrode the enamel, which sets in tooth decay.