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When can tooth decay start in the mouth?

Answer and explanation

Correct answer: When the pH falls below 5.5 (जब pH 5.5 से कम हो जाए)

The governing concept is the effect of pH on tooth enamel. Bacteria in the mouth can produce acids, and when the mouth becomes sufficiently acidic, enamel begins to dissolve. Tooth decay may start when the pH falls below about 5.5. Thus option A is correct. A pH of 7 is neutral, while pH 10 and pH 14 are alkaline; these values do not represent the acidic condition associated with enamel damage in this question.

Related tags

AcidsPhTooth DecayEnamelOral HealthBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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