Taking a Closer Look at Fluoride
Though generations of dental students have been sold on the dental benefits of fluoride, studies over the last decade in particular have suggested a correlation with cancer. Studies conducted by the National Toxicology Program and the New Jersey Department of Health, have shown higher than normal incidents of cancer in male rats exposed to fluoridated water, for example.
Such studies have helped spawn grassroots opposition to fluoridation, and, since 1999, 70 U.S. communities have rejected fluoridation schemes, according to Fluoride Action Network, a watchdog group.
But fluoridation programs flourished even in the face of questions about health impacts. Kropp says the thrust behind fluoridation “is faceless. Some of the big proponents of fluoridation and some of the original experiments done, and done in faulty ways, aren’t around anymore. But you have new generations of dentists and public health officials who were taught in school that this is fine, so there’s no reason to do to the literature. It just gets passed down that way.”
Nonetheless, more and more scientists are refusing to take fluoride’s safety for granted.
Dr. Hardy Limeback, a leading Canadian expert and head of preventive dentistry at the University of Toronto, said he could not comment for this story because he is involved in a two-year review of fluoride for the National Academy of Sciences.
But Limeback, who once supported but now opposes fluoridation, has written extensively on fluoride’s health risks, and his views are shared by many in the scientific community. He has written that global cavity rates have declined mostly as a result of fluoridated toothpaste and that topical applications rather than widespread applications through community water can prevent tooth decay. Limeback and others also point out that industrial sources of fluoride contain harmful chemicals and have not been tested properly.
“Hydrofluorosilicic acid is recovered from the smokestack scrubbers during the production of phosphate fertilizer and sold to most of the major cities in North America, which use this industrial grade source of fluoride to fluoridate drinking water, rather than the more expensive pharmaceutical grade sodium fluoride salt,” he wrote in a public letter in April 2000. “Fluorosilicates have never been tested for safety in humans. Furthermore, these industrial-grade chemicals are contaminated with trace amounts of heavy metals such as lead, arsenic and radium that accumulate in humans.”
Kelly Hearn | AlterNet (read more. . .)
