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The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to made teeth enamel harder by converting $ [3Ca_3(PO_4)_2.Ca(OH)_2]$ to:


( A ) $[CaF_2]$
( B ) $[3(Ca_3(PO_4)_2. CaF_2]$
( C ) $[3(CaF_2).Ca(OH)_2]$
( D ) $[3(Ca(OH)_2].CaF_2]$

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