Calcium phosphate is the major component of hydroxyapatite crystal that form the inorganic portion of the teeth

Calcium phosphate is a mineral comprising calcium ion (Ca²⁺) and phosphate ion ${\mathrm{P}}^{+5}$. It is present in the crown area of the tooth and also in bones. It contain some ${\mathrm{F}}^{-}$ ions too. But it does not contain ${\mathrm{P}}^{+3}$ ions.