Many published human and animal studies have reported an association between fluoride and various cancers, including valid and unrefuted scientific evidence that fluoride can increase the risk of osteosarcoma (a type of bone cancer) in boys and young men, reports the Fluoride Action Network (FAN) in its recent submission to the California Environmental Protection Agency's Office of Environmental Health Hazard Assessment (OEHHA). (1)
Fluoride is commonly added to municipal water supplies and dental products with the intention of reducing tooth decay. However, current scientific evidence shows that swallowing fluoride does much more harm than good.
In 1990 the National Toxicology Program (NTP) reported an increase in osteosarcoma in male rats exposed to fluoride, an increased risk for liver and oral cancers, and an increase in thyroid follicular cell tumors.
Among human studies, Hoover et al. (1991) found a 79% increase in osteosarcoma in males under 20 years old in fluoridated counties, compared to a 4% decrease in non-fluoridated counties over time.
Cohn (1992) similarly reported an increased risk for osteosarcoma in males under age 20 living in fluoridated versus non-fluoridated counties.
Also, the NRC recommends further research be conducted on the effects of fluoride on the risk of bladder cancer.
In addition, the most commonly used fluoridation chemicals (silicofluorides) have been linked with increased levels of lead in children's blood, according to Kathleen Thiessen, Ph.D., a risk analysis professional who has served on two NRC subcommittees dealing with fluoride toxicology.