Utah Gov. Spencer Cox signed a bill banning fluoride March 27.
HB81, which was passed by the state legislature Feb. 21, prohibits the addition of fluoride to public water supplies, but allows people to visit a pharmacist for fluoride supplements to support dental health.
The Utah Dental Association, the American Dental Association and the American Dental Hygienists Association had urged the governor to veto the bill.
Utah is now the first state to pass a statewide ban, although several other states are weighing similar bills, including Ohio and Florida.