Separately, the EPA has a longstanding requirement that water systems cannot have more than 4 milligrams of fluoride per liter of water. That standard is designed to prevent skeletal fluorosis, a potentially crippling disorder which causes weaker bones, stiffness and pain.

Critics have cited near-universal adoption of fluoride toothpaste and other dental products as evidence that the chemical no longer needs to be added to drinking water. Other countries abroad have cut cavity rates without adding it to their water supplies ...

Since 2015, federal health officials have recommended a fluoridation level of 0.7 milligrams per liter of water. For five decades before that, the recommended upper range was 1.2. The World Health

A federal judge has ordered the Environmental Protection Agency (EPA) to address the potential impacts of fluoride in drinking water on IQ levels. In a new ruling this week, Obama-appointed judge Edward Chen ordered the EPA to take regulatory action over the issue.

A landmark federal court ruling found the drinking water additive poses sufficient risk for EPA to act. Fluoridated chemicals have been added to tap water systems since the 1940s. Engin Akyurt/Unsplash In a first-of-its-kind ruling,