Question

tooth decay start when the pH of mouth is lower than 5.5 give reason​

Answer 1

Answer:

When we eat for it contains sugar,then the bacteria present in our mouth break down the sugar to form acids.Tooth decay starts when pH is lower than 5.5 this is because the acid is strong enough to attack the enamel of our teeth and corrode it.This starts the tooth decay.

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Answer 2

when decayed food containing more sugar then sugar breakdown in present of bacteria present in mouth and produce citric acid due to preparation of acid, pH of mouth decreases whenever pH of mouth decreases from 5.4 then starts to decay