EDUCATION UGC NET
ENVIRONMENTAL STUDIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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River water
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Food products
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Both (A) and (B)
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Ground water
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Detailed explanation-1: -Food Sources Trace amounts of fluoride are found naturally in various foods, though people obtain most fluoride from fluoridated water and toothpastes. Brewed black tea and coffee naturally contain fluoride as the plants absorb the mineral in soil.
Detailed explanation-2: -The additional fluoride in toothpaste has beneficial effects on the formation of dental enamel and bones. Sodium fluoride (NaF) is the most common source of fluoride, but stannous fluoride (SnF2), and sodium monofluorophosphate (Na2PO3F) are also used.
Detailed explanation-3: -Approximately 99% of the fluoride in the human body is found in bones and teeth. Fluoride is incorporated into tooth and bone by replacing the hydroxyl ion in hydroxyapatite to form fluorohydroxyapatite.