For what primary purpose is fluoride added to drinking water?

Fluoride is primarily added to drinking water to prevent tooth decay. This practice is based on extensive research that has shown a significant reduction in cavities among populations that consume fluoridated water regularly. The addition of fluoride strengthens tooth enamel, making it more resistant to the acids that cause decay. It also aids in the remineralization process, reversing early signs of tooth decay and contributing to overall oral health. Thus, the primary focus of fluoridation is dental health rather than any other potential benefits or enhancements associated with water.