Fluoride is a naturally occurring mineral that has been shown to strengthen teeth and reduce cavities. Many municipalities add fluoride to their drinking water—a process called community water fluoridation—as a public health measure to support dental health. In recent years, however, some have claimed that ingesting fluoride can harm children’s IQ. Now researchers at the University of Minnesota have led a team that investigated the connection between fluoride in drinking water and children’s IQ to see if these claims had merit. The work is published in the journal Proceedings of the National Academy of Sciences.



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