WASHINGTON (AP) — The Food and Drug Administration on Friday moved to limit the use of fluoride supplements used to strengthen children’s teeth, the latest action by Health Secretary Robert F. Kennedy Jr. and his deputies against a chemical that is a mainstay of dental care.

The FDA said that the products are no longer recommended for children younger than 3 and those who are older but don’t face serious risks of tooth decay. Previously, the products have been prescribed for children as young as six months.

The action stopped short of FDA statements in May suggesting regulators would seek the removal of the products from the market. Instead, the agency sent letters to four companies warning them not to market their products outside the new limits.

Fluoride tablets and lozenges are somet

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