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25/01/1945 1st US city to fluoridate its water

It was Grand Rapids in Michigan. Main purpose of controlled addition of fluoride to a public water supply is to reduce tooth decay. The efficacy in children is proved, while in adults is less clear. Water fluoridation In the United states were proposed by a group of scientist led by H. Trendley Dean. They claimed that fluoride concentration of about 1 mg/L was associated with substantially fewer tooth cavities.

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