Science chemistry - acids bases and salts

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

Dharun
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Shreya
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Tooth decay starts when the pH of the mouth is lower than 5.5. ... It does not dissolve in water, but is corroded when the pH in the mouth is below 5.5. Bacteria present in the mouth produce acids by degradation of sugar and food particles remaining in the mouth after eating..