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Which of the following from doesn't exist in enamel? (a) F (b) Ca+2 (c) p+3(d) p-5 |
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Answer» Correct option is (c) p+3 The F ions make the enamel on teeth much harder by converting hydroxyapatite, [3(Ca3(PO4)2 Ca(OH)2], the enamel on the surface of the teeth, into much harder fluorapatite, [3(Ca3(PO4)2.CaF2]. |
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