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Tooth enamel begins to corrode once the pH inside the mouth falls below:
A8.5
B7.5
C9.5
D5.5
Answer & Solution
Correct answer: D. 5.5
1. Bacteria make acid from leftover sugar.
2. Enamel dissolves once the mouth turns acidic enough.
3. That point is a pH of 5.5.
_Source: syllabus Science Class X, Chapter 2, Acids, Bases and Salts._
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