dental-health

How Philippe-Guy Woog's 1954 Broxodent, a glue-gun toy frog idea, and University of Washington research built the $4 billion electric toothbrush market — and what the evidence says it does.

Fluoride in drinking water has been called everything from a public health triumph to a covert poisoning. Here is what Cochrane, the CDC, and the National Toxicology Program found, and where the evidence is genuinely thin.