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 resistant to chemical/biological attack. I believe that fluorine should be recorded as "an essential trace element" 121.220.134.88 (talk) 01:02, 4 June 2012 (UTC)
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