1928

Researcher Frederick S. McKay discovers teeth with "Colorado Brown Stain" show "a singular absence of decay." He determines the dis-coloration and tooth protection are caused by something in the local water. In 1931, the substance is confirmed to be fluoride.
kwch-1928-20120925-001

( September 25, 2012 )

Researcher Frederick S. McKay discovers teeth with "Colorado Brown Stain" show "a singular absence of decay." He determines the dis-coloration and tooth protection are caused by something in the local water. In 1931, the substance is confirmed to be fluoride.

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