1936

Trendley Dean with the U.S. Public Health Service discovers fluoride concentrations of about one part per million prevent tooth decay while not discoloring teeth.
kwch-1936-20120925-001

( September 25, 2012 )

Trendley Dean with the U.S. Public Health Service discovers fluoride concentrations of about one part per million prevent tooth decay while not discoloring teeth.

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