U.S. health officials are announcing an effort to phase out ingestible fluoride supplements used to strengthen children's teeth, citing possible health risks. The announcement Tuesday is the latest action by Robert F. Kennedy Jr. against a substance that has been a mainstay of dental care for decades. The Food and Drug Administration said it will conduct a scientific review of the products by late October with the aim of removing them from the market. Formally withdrawing medical products requires a lengthy rulemaking process that can take years. Instead, the FDA will ask manufacturers to voluntary pull their products.