RRB Group D 19-Sep-2018 Shift 1 Solved Paper

Question : 94 of 100

Marks: +1, -0

Tooth decay starts when the pH of the mouth is:

Solution:

Tooth starts decaying when the

{pH}

of our mouth is lower than

5.5 .

This is because below this pH value, the acid is strong enough to attack the enamel of our teeth and corrode it.

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