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Q: At what pH value tooth starts to decay?
  • A. 11.2
  • B. 6.5
  • C. 5.5
  • D. 7.5
Correct Answer: Option C - Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating. Tooth decay starts when the pH of the mouth is lower than 5.5. Using toothpastes, which are generally basic, for cleaning the teeth can neutralise the excess acid and prevent tooth decay.
C. Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating. Tooth decay starts when the pH of the mouth is lower than 5.5. Using toothpastes, which are generally basic, for cleaning the teeth can neutralise the excess acid and prevent tooth decay.

Explanations:

Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating. Tooth decay starts when the pH of the mouth is lower than 5.5. Using toothpastes, which are generally basic, for cleaning the teeth can neutralise the excess acid and prevent tooth decay.