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.

Gov. Ron DeSantis of Florida signed a bill into law on Thursday that bans the addition of fluoride to public water supplies, making Florida the second state to prohibit the widespread public health practice.