alleryStart learning →Tooth decay begins when the pH of the mouth falls below about
A5.5
B7.0
C8.0
D9.5
Answer & Solution
Correct answer: A. 5.5
1. Tooth enamel is made of hard calcium phosphate.
2. Bacteria in the mouth make acids that lower the pH.
3. Below about 5.5 the enamel starts to corrode, beginning decay.
_Source: AP/TS SCERT Class 10 Physical Science, "Acids, Bases and Salts"_
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