President-elect Donald Trump has picked Robert F. Kennedy Jr. as his Health and Human Services secretary and while we don’t know what the policies will be, one thing Kennedy has signaled he would look at is fluoridation of water across the United States.

Dental experts say the amount of fluoride added to water is effective in reducing tooth decay and safe; others say it’s not needed.

The Washington Post and other media noted that medical organizations responded by calling Kennedy’s assertions unfounded at the levels of fluoridation used in drinking water. But many of them have also noted that in an NBC interview, Trump said possible action against fluoridation of water “sounds OK to me ... You know, it’s possible.”