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Robert Kennedy Jr. said Donald Trump will push to remove fluoride from drinking water on his first day in office.

Fluoride strengthens teeth and reduces tooth decay by replacing minerals lost through normal wear and tear, according to the CDC.

But Mr. Kennedy made a statement about X, along with various statements about the health effects of fluoride.

In 1950, federal officials approved water fluoridation to prevent tooth decay and continued to promote it even after fluoridated toothpaste brands hit the market a few years later.

In 2015, authorities lowered their recommendations for fluoride levels in drinking water to combat a dental disease called fluorosis, which can cause stains on teeth and is becoming increasingly common among children in the United States.

This August, the National Toxicology Program found “with moderate confidence” that there is an association between higher levels of fluoride exposure and lower IQ in children.

He based his conclusion on studies in which fluoride levels were about twice the recommended limit for drinking water.

A federal judge later cited the study in ordering the U.S. Environmental Protection Agency to continue regulating fluoride in drinking water.

U.S. District Judge Edward Chen cautioned that it was not certain that the amount of fluoride commonly added to water causes lower IQ in children, but he concluded that a growing body of research suggests there may be an unreasonable risk.

Kennedy has a long history of pushing debunked theories about vaccine safety.