Fluoridated water is water that has had fluoride added to it, a mineral known for its ability to help prevent tooth decay. Many communities add fluoride to their public water supply to improve dental health among residents, especially children. The practice is supported by various health organizations, including the Centers for Disease Control and Prevention and the World Health Organization. Fluoride works by strengthening tooth enamel, making it more resistant to acid attacks from bacteria in the mouth. While some people have concerns about the safety of fluoridated water, numerous studies have shown that it is safe and effective when used at recommended levels.