The Department of Health and Human Services has lowered its fluoride suggestions, recommending that public tap water not exceed .7 ppm. Previous recommendations were for between .7 and 1.2 ppm.The recommendation was first proposed in 2011, and many large cities have already lowered levels. The DHHS said the change could help prevent fluorosis, which can cause white spots and even brown stains and mottling on teeth. According to a Newsweek article, 41 percent of Americans show some sign of fluorosis.“While additional sources of fluoride are more widely used than they were in 1962, the need for community water fluoridation still
