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McKay collected water samples from several areas where brown teeth were common and sent them to a chemist who examined them using a new technique, spectrographic analysis. The chemist found concentrations of fluoride in the samples as high as 12 parts per million, and researchers quickly confirmed in epidemiological studies that fluoride was the cause of the brown teeth.
The New York Times reported the finding on June 14, 1931, above left, the first time the newspaper mentioned fluoride in connection ...
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