What to know about fluoride in water following RFK Jr.'s health claims

Robert F. Kennedy Jr.'s recent comments on fluoride are prompting questions about its safety and why it's used in drinking water.

Kennedy, a former presidential candidate turned Trump supporter who has long shared anti-vaccine views, said on social media Saturday that Donald Trump would push to remove fluoride from drinking water on his first day in office if elected president. Trump has previously suggested he'd put Kennedy in charge of health initiatives.

On Sunday, Trump told NBC News he had not spoken to Kennedy about fluoride yet, "but it sounds OK to me. You know it's possible."