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Oct 31 (Reuters) - The U.S. Food and Drug Administration has warned four companies that it plans to take enforcement action over their sale of unapproved fluoride-based prescription drugs for children, the agency said on Friday. Health Secretary Robert F. Kennedy Jr., who has long criticized fluoride use, said the move marks a major step in protecting children's health. Sign up here. "This Halloween, the FDA is driving a stake through the heart of outdated science," Kennedy said. "It's scary that these products have been used for decades without approval." Fluoride — a mineral that occurs naturally in water, soil and air — has been demonstrated to prevent dental cavities and tooth decay. For decades, it has been added to community water supplies and dental products such as toothpaste. Reporting by Kamal Choudhury in Bengaluru; Editing by Alan Barona
