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Why does mouth pH decrease during tooth decay?

Answer and explanation

Correct answer: Bacteria form acids from sugar

The governing concept is bacterial fermentation and pH. Food sugars left on teeth are metabolised by oral bacteria, which produce organic acids. The increased hydrogen-ion concentration lowers mouth pH, making the tooth enamel vulnerable to demineralisation and decay. Thus option A is correct. Toothpaste is generally basic, saliva does not always form a base, and teeth do not produce hydrogen gas.

Related tags

Tooth DecayBacteriaPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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