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Question

Tooth decay is the destruction of .

A
enamel
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B
cementum
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C
gum
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Solution

The correct option is A enamel
The white enamel coating of our teeth is made up of insoluble calcium phosphate, which is quite hard. The bacteria present in the mouth break down the sugar in our food to lactic acid.

The formation of this acid causes a decrease in pH and when the pH in the mouth falls below 5.5, the enamel gets corroded causing cavity.

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