The main constituent of enamel on the surface of teeth is:
- A$[3 Ca_3(PO_4)_2 \cdot CaF_2]$
- B$Ca_3(PO_4)_2 \cdot H_2O$
- C$[3 Ca_3(PO_4)_2 \cdot Ca(OH)_2]$
- D$CaF_2$
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