A recent report from the US government has determined, with moderate confidence, a link between children consuming higher-than-recommended levels of fluoride and lower IQ. 

Guardian

The addition of low levels of fluoride to drinking water has long been recognized as a major public health accomplishment by the US Centers for Disease Control. The presence of fluoride helps to strengthen teeth and prevent cavities.

New York Post

The World Health Organization (WHO) has recommended a safe fluoride level of 1.5 mg/L in drinking water, which is higher than the federal health officials' recommended fluoridation level of 0.7 mg per liter of water.

Newsweek

The National Toxicology Program, part of the Department of Health and Human Services, published a report analyzing previous non-US studies. The report links increased fluoride levels from all sources, not just drinking water, to potential neurological risks in children.

USA Today

The research is conclusive, all indicating that children with fluoride levels exceeding 1.5 mg/L  in their drinking water have lower IQs. The report did not specifically name the IQ loss, although some research found a 2 to 5-point drop.

The Economic Times

According to the research, 0.6% of Americans—1.9 million people—use water with naturally occurring fluoride levels of 1.5 milligrams or higher. The 324-page paper said additional research is required on the consequences of reduced fluoride levels.

Fluoride in drinking water at twice safe limit linked to lower IQ in children

Fluoride in drinking water at twice safe limit linked to lower IQ in children

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Fluoride in drinking water at twice safe limit linked to lower IQ in children

Fluoride in drinking water at twice safe limit linked to lower IQ in children

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