Why does tooth decay start when the pH of mouth is lower than 5.5? – InterviewSolution

1.	Why does tooth decay start when the pH of mouth is lower than 5.5?
Answer» When the pH in mouth is lower than 5.5, it means acids are formed due to food decay by bacteria in our mouth. The acid released reacts with enamel, which is made up of calcium phosphate and tooth decay starts.

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