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Q.

Is it true that when the pH of the mouth decreases below pH $5.5$ decaying of the tooth starts?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is True.
The enamel of the tooth is made of calcium phosphate. As the pH of the mouth decreases, the acid becomes stronger to attack the tooth's enamel, and the corrosion of tooth enamel occurs—this attack of acid to the tooth's enamel sets for tooth decay. The corrosion of tooth enamel by acid is known as tooth decay. Hence below a pH of

5.5

in the mouth, tooth enamel decays.

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