A study released in February by the Collaborative on Health and the Environments Learning and Development Disabilities Initiative found excessive ingestion of fluoride can decrease thyroid hormone levels. It also cited a recent Chinese study that links lower IQ levels in children with fluoridated drinking water.
In 2006, the National Academy of Sciences found the Environmental Protection Agency's maximum standard for fluoride of 4 milligrams per liter could cause health problems such as dental fluorosis and weakened bones over a lifetime of consumption.
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