Science chemistry - acids bases and salts

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

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pH of of moths is lower than 5.5, which means condition of mouth is acidic. Mouth becomes acidic when bacteria present in the mouth acts on the sugary food particles. Acids formed act on the calcium salt(tooth enamel is made up of calcium salts)which in turn form dentine forming cavities over a short period of time.

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