Solved: Teeth enamel is hydroxyapatite [Ca3(PO4)3OH]. When

Chapter 15, Problem 15.53

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Teeth enamel is hydroxyapatite [Ca3(PO4)3OH]. When it dissolves in water (a process called demineralization), it dissociates as follows: Ca5(PO4)3OH 5Ca21 1 3PO4 32 1 OH2 The reverse process, called remineralization, is the bodys natural defense against tooth decay. Acids produced from food remove the OH2 ions and thereby weaken the enamel layer. Most toothpastes contain a fluoride compound such as NaF or SnF2. What is the function of these compounds in preventing tooth decay?

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