Florida on Thursday became the second U.S. state to prohibit fluoride, a mineral used for decades to protect teeth from decay, in its water systems.

Florida has become the second state in the nation to ban the addition of fluoride to public drinking water. On Thursday, Gov. Ron DeSantis signed the Florida Farm Bill, which includes language banning the use of any additive in a public water system that does not meet the new definition of a “water quality additive”: a chemical or substance used in public water to specifically address drinking water standards,

Florida Gov. Ron DeSantis signed a bill Thursday to ban fluoride in public water, making it the second state to do so.