Question

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

Answer 1

Demineralization occurs at pH levels lower than 5.5 from a scale of 14. pH levels lower than 7 are acidic and pH levels higher than 7 are alkaline. It is found that when sugar is introduced, cavity causing bacteria can utilize it and bring the saliva to very acidic levels in as little as 30 minutes. During demineralization, crucial molecules are drawn out of the enamel, thus weakening its structure.

Answer 2

Answer:

Bacteria present in the mouth produce acids by degradation of

sugar and food particles remaining in the mouth after eating. Using toothpastes, which

are generally basic, for cleaning the teeth can neutralize the excess acid and prevent

tooth decay.