Q6 of 48 Page 9

Calcium phosphate is present in tooth enamel. Its nature is

Calcium phosphate Ca3(PO4)2 is basic salt, as it is formed by the combination of a weak acid (phosphoric acid) and slightly stronger base (calcium hydroxide). Bacteria feed on sugars commonly found in foods and produce acids in the mouth decreasing the pH level to 5.5 or lower thus eroding the enamel that is basic in nature.


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