Tooth decay starts when the pH of our mouth is_______.

mediumMCQIndian Competitive Exams2026Chemistry

1 mark

Tooth decay starts when the pH of our mouth is_______.

Solution & Step-by-step Explanation

Tooth decay begins when the pH in the oral cavity drops lower than 5.5. At this acidic level, the tooth enamel (made of calcium hydroxyapatite) begins to demineralize.

Try it yourself before checking the explanation above.

Tooth decay starts when the pH of our mouth is_______.

A

higher than 5.5

B

higher than 7.5

C

higher than 6.5

D

lower than 5.5

Practice with timed mock tests and track your performance across Chemistry.