Fluoride in Britain's water and toothpaste is the subject, and the film lines up the people who built the case for it against the ones who now question it. Host Shahnaz Pakraven, then a Channel 4 presenter, interviews Dr. Michael Lennon of the British Fluoridation Society defending water fluoridation, and Dr. Paul Connett, an environmental chemist at St. Lawrence University, laying out the health concerns. Dr. Phyllis Mullenix describes the rat studies she ran at Harvard's Forsyth Dental Institute linking fluoride to neurological damage, research that cost her the job. Dr. John Hein, the retired Colgate dental director who helped develop fluoride toothpaste, explains how advertising made it a household staple. The film also visits the Quail family, whose daughter has dental fluorosis, and notes that Birmingham was one of the few UK cities fluoridating its water at the time, with the fluoride itself imported from Holland, a country that had already banned the practice. Surgeon Andrew Thomas and Dr. Peter Mansfield add clinical and public-health objections. Broadcast on Channel 4 in June 1997, the program lets both camps make their case without resolving which one is right.