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Why does enamel risk increase when tooth pH goes below 5.5?

Answer and explanation

Correct answer: Acidity can start dissolving enamel

Dental enamel contains mineral crystals mainly based on calcium hydroxyapatite. Bacteria metabolise sugars and produce acids, lowering the pH in dental plaque. When the pH falls below about 5.5, the acidic environment favours dissolution of enamel minerals faster than repair can occur. This demineralisation increases tooth-decay risk, so option A is correct. The other options do not describe the acid–mineral process.

Related tags

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

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