Kennedy Jr. has previously said that if Republican President-elect Donald Trump won the White House, the administration would advise water systems in the United States to remove fluoride. This is despite experts and officials saying the mineral is both safe and beneficial to people’s dental health.

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.

The former Independent candidate, who is expected to be health czar under Donald Trump, has a history of spreading conspiracy theories

Former President Donald Trump on Sunday expressed tentative support for Robert F. Kennedy Jr.’s plan to order the removal of fluoride from water supplies during a potential second Trump term, saying that it “sounds OK to me.

The CDC calls the practice of adding fluoride to tap water systems one of the 10 greatest public health achievements of the last century.

For years, local water authorities have considered the addition of low concentrations of fluoride to drinking water a public health achievement. The Centers for Disease Control and Prevention recommends it, citing evidence showing that fluoride prevents cavities in children — the No. 1 chronic disease in kids.

RFK Jr. repeated his plan to remove fluoride from drinking water, despite the CDC calling fluoridation one of the “ten great public health achievements” of the 20th century.