Enamel is the hard calcified tissue which covers the dentine of a tooth. It is the hardest substance produced by vertebrates.
Enamel is composed almost entirely of inorganic calcium phosphate (apatite), most of which is arranged in a crystalline lattice structure.
Source: GreenFacts
Source:
Sam Fentress Tooth section
Dental fluorosis - Dentine - Fluoride
GreenFacts Summary on Fluoride:
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