Utah will become the first state to ban fluoride in public drinking water, despite widespread opposition from dentists and national health organizations. Republican Gov. Spencer Cox said he would sign legislation that bars cities and communities from deciding whether to add the mineral to their water systems.

The Utah ban, set to begin in early May, follows the appointment of U.S. health secretary Robert F. Kennedy Jr., who opposes the addition of fluoride to public water systems and has said Republican President Donald Trump will call for an end to its use.

Utah has passed a law banning fluoridated water. The state’s governor says he will sign the bill, despite objections from the health care community. The Centers for Disease Control and Prevention has called the addition of fluoride to drinking water one of the 10 best public-health achievements of the 20th century.