Question

Tooth decay starts when the pH of the mouth is less than _______.
1. 3.5
2. 5.5
3. 7.5
4. 10.5

Answer 1

Correct Answer - Option 2 : 5.5

Explanation:

• When the pH value in the mouth falls below 5.5 then the tooth decay starts.
• It is happened due to the bacteria present in the mouth.
• The Bacteria produce the acid by the degradation of sugar and food particles, which remain in the mouth after eating.
• Acid affects the enamel of teeth and gradually tooth decays.​