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Why is a mouth pH below 5.5 dangerous in tooth decay?

Answer and explanation

Correct answer: Enamel can start dissolving

The governing concept is the effect of pH on tooth enamel. Bacteria use sugars and produce acids, lowering the pH in dental plaque. Tooth enamel is largely calcium phosphate, which becomes more vulnerable to dissolution in sufficiently acidic conditions. When the mouth pH falls below about 5.5, mineral loss can begin and cavities may develop. Hence option A is correct; low pH does not strengthen enamel or convert sugar into a base.

Related tags

Tooth DecayEnamelPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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