1.

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ions are required to make teeth enamel harder by converting [3Ca3(PO4)2.Ca(OH)2] to

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The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ions are required to make teeth enamel harder by converting [3Ca3(PO4)2.Ca(OH)2] to



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