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The reintroduction of mineral salts into calcified tissues such as bone, enamel, dentine, and cementum. During enamel remineralization, mineral ions restore the deficient latticework structure of the hydroxyapatite crystals. The saliva is a supersaturated solution of calcium and phosphate ions normally in equilibrium with the tooth enamel, but if the pH of the saliva changes either demineralization or remineralization takes place according to the equation:Ca5(PO4)OH↔5Ca2++3PO43+OH−

The critical pH below which demineralization of enamel takes place is 5.2–5.5.

Subjects: Dentistry.

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