The most comprehensive report on fluoride was published in 2006 by the National Research Council, done at the behest of the Environmental Protection Agency. That group found that the upper limit for fluoride, at 4 ppm, was too high to prevent a certain percentage of kids from developing severe dental fluorosis and recommended the EPA lower this limit. The agency has yet to change this limit.
Water is fluoridated in 29 of the 30 largest cities. The exception is Portland, Ore. For the fourth time since 1956, voters in Portland defeated a plan on May 21 to add fluoride to the public water supply. For weeks, residents had been contentiously debating fluoridation.
One study published in the fall of 2012 in the journal Environmental Health Perspectives found a link between high fluoride levels found naturally in drinking water in China and elsewhere in the world, and lower IQs in children. The paper looked at the results of 27 different studies, 26 of which found a link between high-fluoride drinking water and lower IQ. The average IQ difference between high and low fluoride areas was 7 points, the study found.
Article originally on LiveScience.com.
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