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Fluorine is useful for protecting tooth enamel, but this seems to fall short of what one might consider an actual biological function. The protective effects of fluorine due to an arbitrary characteristic of enamel that is not necessary for tooth formation; I don't think enamel "evolved" to accept
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I think that it is incorrect to show
Fluorine (coloured yellow) as having "no identified biological function in humans". Human tooth enamel normally contains fluorine and tooth enamel in humans with little fluorine in their dietary intake develop a "fluorine-deficient" tooth enamel which is less
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fluorine. If there is a reference which suggests natural fluorine in the environment is common enough to have an effect on teeth, that might help.
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resistant to chemical/biological attack. I believe that fluorine should be recorded as "an essential trace element"
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Talk:Abundance of the chemical elements/Archive 1#Biological requirement chart colors
67:. To avoid confusion, please go there to contribute.
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