The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting `[3Ca_(3)(PO_(4))_(2).Ca(OH)_(2)]`
A. `[3{Ca(OH)_(2)}.CaF_(2)]`
B. `[CaF_(2)]`
C. `[3(CaF_(2).Ca(OH)_(2)]`
D. `[3Ca_(3)(PO_(4))_(2).CaF_(2)]`

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting `

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