A U.S. District Court in California court ruled that 0.7 milligrams per liter of fluoride in drinking water poses an unreasonable risk to health.

Ladapo on Friday also appeared in Winter Haven, where city commissioners earlier this month voted 3-2 to remove fluoride from its drinking water by the end of the year. Community water fluoridation has been used for seven decades as a method of preventing tooth decay.

It was the latest in a long list of public health recommendations from Ladapo criticized by associations that represent the people providing the care.