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Dentists discovered tooth-saving properties of fluoride by accident

from Smithsonian

In 1901, a dentist named Dr. Fredrick McKay moved to Colorado Springs and noticed what the area's residents called "Colorado brown stain" on patients' teeth. After years of treating patients, McKay figured that the stain must be coming from the water supply they shared. But he also noticed something interesting: People with the brown stains had less tooth decay. In 1930, a chemist with the Aluminum Company of American analyzed the well that the spotted-toothed town drank from and found that the water had high concentrations of fluoride. more

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