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The presence of soluble fluoride ion upt...

The presence of soluble fluoride ion upto 1 ppm concentration in drinking water , is :

A

Harmful for teeth

B

Harmful to skin

C

Harmful to bones

D

Safe for teeth

Text Solution

Verified by Experts

The correct Answer is:
D
Fluoride `(F^-)` ion conc. upto 1 ppm makes the enamel of teeth much harder by converting
`underset("hydroxyapatite")([3Ca_3 (PO_4)_2 . Ca (OH)_2 ]) overset(F^(-))to underset("(harder)")underset("Fluorapatite")([3Ca_3 (PO_4)_2 . CaF_2])`
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