I recently heard the tail end of a radio debate about the fluoridation of water, a perennial American controversy that has spiked once again. One speaker said fluoride guarded against cavities; another said it injured our teeth in the guise of protecting them.
Then the calls started coming in. To one outraged listener, the latest attacks on fluoridation reflected a deeply anti-intellectual strain in American public life. “These people just don't believe in science,” the caller complained.
Actually, they do. Unlike earlier generations of anti-fluoridation campaigners, “these people” staked their claims squarely on scientific evidence and argument. That doesn't make them correct, of course. But it does represent a huge victory for science itself.
Across the country, science seems mired in disrepute. Most of the Republican candidates for president, for example, either flatly reject or doubt man-made causes of climate change. And at least three of them have publicly doubted or rejected human evolution.
By contrast, present-day critics of fluoridation embrace scientific rules, methods and practices. Consider Fairbanks, Alaska, one of about 200 jurisdictions that have stopped adding fluoride to their water over the past four years. Following an extensive review by doctors, dentists and scientists, Fairbanks officials decided there simply wasn't enough data to support fluoridation.
About three-quarters of Americans still drink water that has been treated with fluoride. But some experts claim that fluoridation is also responsible for an increase in dental fluorosis, which causes yellow or white spots on teeth. They also warn that too much fluoride can weaken bones, leading to increased risk of fracture.
Most of these critics also acknowledge that limited amounts of fluoride can improve long-term dental hygiene. But they say that people already get enough fluoride from toothpaste, mouthwash and other sources. Are they right? I doubt it. The Centers for Disease Control and Prevention and the American Dental Association continue to recommend water fluoridation, which they say reduces tooth decay by 25 percent. And I'm inclined to follow the lead of the leading professional organizations on matters involving their own vocations.