The $F^{-}$ ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.
- A$[3(Ca_3(PO_4)_2) \cdot CaF_2]$
- B$[3(Ca_2(PO_4)_2) \cdot Ca(OH)_2]$
- C$[3(Ca_3(PO_4)_3) \cdot CaF_2]$
- D$[3(Ca_3(PO_4)_2) \cdot Ca(OH)_2]$
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