Water fluoridation helps prevent tooth decay – how growing opposition threatens a 70-year-old health practice

Fluoride is a mineral found in water that strengthens teeth and helps prevent cavities. vitapix/E+ via Getty Images

Driving through downtown Dallas, you might see a striking banner hanging at the U-turn bridge, near the Walnut Hill exit on Central Expressway (US 75): “Stop Fluoridation!” Below it, other banners demand action and warn of supposed dangers.

It’s not the first time fluoride has been at the center of public debate.