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Tooth decay generally starts when the pH falls below which value?

Answer and explanation

Correct answer: 5.5

Tooth enamel is mainly a mineral containing calcium compounds. Acids produced by bacteria from sugars lower the pH in dental plaque. When the pH falls below approximately 5.5, enamel begins to dissolve more readily, increasing the risk of tooth decay. Thus option C, 5.5, is correct. A pH of 7 is neutral, while 10.5 and 14 are alkaline and do not represent the acidic condition that damages enamel.

Related tags

Tooth-DecayPhEnamelOral-AcidsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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