(Reuters) -The U.S. Food and Drug Administration said on Friday it warned four companies that it plans to take enforcement action over their sale of unapproved fluoride-based prescription drugs for children, as part of a broader federal push to remove ingestible fluoride supplements from the market.

Health Secretary Robert F. Kennedy Jr., a longtime critic of fluoride use, said the decision marks a major step in protecting children’s health.

“This Halloween, the FDA is driving a stake through the heart of outdated science and protecting our kids from the risks associated with ingestible fluoride,” Kennedy said.

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

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