Also on Monday, the U.S. Environmental Protection Agency announced it is reviewing “new scientific information” on potential health risks of fluoride in drinking water. The EPA sets the maximum level allowed in public water systems.

Kennedy told The Associated Press of his plans after a news conference with EPA Administrator Lee Zeldin in Salt Lake City.

Kennedy cannot order communities to stop fluoridation, but he can direct the CDC to stop recommending it and work with the EPA to change the allowed amount.

Utah last month became the first state to ban fluoride in public drinking water, pushing past opposition from dentists and national health organizations who warned the move would disproportionately hurt low-income residents who can’t afford regular dentist visits.

Republican Gov. Spencer Cox signed legislation barring cities and communities from deciding whether to add the cavity-preventing mineral to their drinking water. Water systems across the state must stop fluoridation by May 7.

Kennedy praised Utah for emerging as “the leader in making America healthy again.” He was flanked by Utah legislative leaders and the sponsor of the state’s fluoride law.

“I’m very, very proud of this state for being the first state to ban it, and I hope many more will,” he said.

Kennedy oversees the CDC, whose recommendations are widely followed but not mandatory. State and local governments decide whether to add fluoride to water and, if so, how much — as long as it doesn’t exceed a maximum set by the EPA, which is currently 4 milligrams per liter.

Zeldin said his agency was launching a renewed examination of scientific studies on the potential health risks of fluoride in drinking water to help inform any changes to the national standards.

“When this evaluation is completed, we will have an updated foundational scientific evaluation that will inform the agency’s future steps,” Zeldin said. “Secretary Kennedy has long been at the forefront of this issue. His advocacy was instrumental in our decision to review fluoride exposure risks, and we are committed to working alongside him, utilizing sound science as we advance our mission of protecting human health and the environment.”

Fluoride strengthens teeth and reduces cavities by replacing minerals lost during normal wear and tear, according to the CDC. In 1950, federal officials endorsed water fluoridation to prevent tooth decay, and in 1962 they set guidelines for how much should be added to water.

Kennedy, a former environmental lawyer, has called fluoride a “dangerous neurotoxin” and said it has been associated with arthritis, bone breaks and thyroid disease. Some studies have suggested such links might exist, usually at higher-than-recommended fluoride levels, though some reviewers have questioned the quality of available evidence and said no definitive conclusions can be drawn.

In November, just days before the presidential election, Kennedy declared Donald Trump would push to remove fluoride from drinking water on his first day as president. That didn’t happen, but Trump later picked Kennedy to run the U.S. Department of Health and Human Services, where he has been expected to take some kind of action. Meanwhile, some localities have gone ahead with deciding whether to keep adding fluoride.

Related to all this: A massive round of staffing cuts last week across federal agencies included elimination of the CDC’s 20-person Division of Oral Health. That office managed grants to local agencies to improve dental health and, in some cases, encourage fluoridation.

Fluoride can come from a number of sources, but drinking water is the main one for Americans, researchers say. Nearly two-thirds of the U.S. population gets fluoridated drinking water, according to CDC data. The addition of low levels of fluoride to drinking water was long considered one of the greatest public health achievements of the last century.

About one-third of community water systems — 17,000 out of 51,000 across the U.S. — fluoridated their water, according to a 2022 CDC analysis. The agency currently recommends 0.7 milligrams of fluoride per liter of water.

But over time, studies have documented potential problems. Too much fluoride has been associated with streaking or spots on teeth. Studies also have traced a link between excess fluoride and brain development.

A report last year by the federal government’s National Toxicology Program, which summarized studies conducted in Canada, China, India, Iran, Pakistan and Mexico, concluded that drinking water with more than 1.5 milligrams of fluoride per liter — more than twice the recommended level in the U.S. — was associated with lower IQs in kids.

The American Dental Association said decades of fluoride in drinking water have been shown to reduce tooth decay. The group said it was willing to help conduct high-quality studies to settle the issue.

“When government officials like Secretary Kennedy stand behind the commentary of misinformation and distrust peer-reviewed research, it is injurious to public health,” said the association’s president, Brett Kessler.

Utah Oral Health Coalition chairperson Lorna Koci said Monday that she hopes other states push back against the removal of fluoride and that Kennedy’s visit to celebrate her state’s fluoride ban underscores the political motivations of those who support it.

“This seems to be less about fluoride and more about power,” Koci said.