Toothpaste prevents tooth decay by :

[amp_mcq option1=”neutralizing the excess acidity.” option2=”means of emulsification.” option3=”the action of fluoride.” option4=”making a coat of calcium over the teeth surface.” correct=”option3″]

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UPSC NDA-1 – 2023

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The correct answer is C) the action of fluoride.

The primary mechanism by which toothpaste prevents tooth decay is through the action of fluoride. Fluoride incorporated into toothpaste strengthens tooth enamel by promoting the formation of fluorapatite, a crystalline structure more resistant to acid dissolution than hydroxyapatite, the main component of enamel.

Fluoride also aids in the remineralization of early enamel lesions and inhibits the ability of plaque bacteria to produce acids. While toothpaste may also contain ingredients that help neutralize acids (Option A), fluoride is the key active ingredient specifically responsible for the significant reduction in dental caries incidence seen with the widespread use of fluoride toothpaste. Option B (emulsification) is unrelated to preventing decay. Option D (making a coat of calcium) is an inaccurate description of how toothpaste ingredients work.

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