Is fluoride in our drinking water safe or toxic? There has been a great deal of debate on this issue. In the 1940s, the United States began adding fluoride to water supplies across the country to help nourish teeth and prevent tooth decay. However, ingesting too much fluoride can lead to fluorosis. This is a condition that causes teeth to become discolored and appear stained. In recent years, some communities across the United States have voted to stop the fluoridation programs. The American Dental Association encourages fluoridated tap water, as long as the fluoride levels are not too high. They maintain that fluoride is safe and helps prevent tooth decay. Use the drop-down menus to complete the statement. Passage provides a better argument because it includes that is not included in the other passage.