Tooth decay starts when the pH of the mouth is less than:
A
4.5
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B
5.5
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C
6.5
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D
7.5
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Solution
The correct option is D 5.5 Tooth enamel made up of calcium phosphate is the hardest substances in the body. It does not dissolve in water, but is corroded when the pH is the mouth is below 5.5.