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required quantity of Soluble fluorides are often added in drinking water to bring its concentration to safe levels because F^- ions make the enamal on teeth much harder by covering with:

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$3 {Ca}_{3} {({PO}_{4})}_{2} \cdot Ca (OH)_{2}$

$3 {Ca}_{3} {({PO}_{4})}_{2} \cdot {CaF}_{2}$

CaF₂

$3 {CaF}_{2} \cdot Ca (OH)_{2}$

answer is D.

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enamel contain calcium phosphate and fluoride

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