Days before the election, Kennedy posted on social media that a Trump White House would advise all U.S. water systems to remove fluoride from the public water supply, which goes against public health recommendations yet jibes with a large number of people who question the safety of fluoridating water.

With President-elect Donald Trump in the White House, the 21st century may be another story. Robert F. Kennedy Jr., whom Trump has pledged to let “go wild” on public health under his administration, is an outspoken opponent of adding fluoride to drinking water. He intends to take action.

Fluoride helps prevent tooth decay. It occurs naturally in some foods—tea, potatoes and shrimp, for example—and in some water. In 1945 Grand Rapids, in Michigan, became the first American city to add it to its drinking water. Today more than two-thirds of Americans have water with added fluoride piped into their homes.

Robert F. Kennedy Jr., who is expected to have a spot in the Trump administration, feels fluoride can lead to a slew of health problems.

Gov. Kathy Hochul announced on Saturday that she signed legislation allowing for greater access to fluoride treatments for pediatric dental patients to “[keep] our kids healthy and strong.”