Soluble fluoride concentration upto 1 ppm in drinking water make the enamel on teeth much harder.
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[3Ca3 (PO4 )2 .Ca(OH)2] + 2FΘ →[3Ca3 (PO4 )2 .CaF2 ] + 2OHΘ
(drinking water upto 1ppm) (Harder teeth enamel)
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