Cancer: Osteosarcoma (bone cancer) has been identified as a risk in young boys in a recently published Harvard study (Bassin, Cancer Causes and Control, 2006). The author of this study, Dr. Elise Bassin, acknowledges that perhaps it is the use of these untested and contaminated fluorosilicates mentioned above that caused the over 500% increase risk of bone cancer in young boys. The long-awaited study published by her former PhD supervisor (Dr. Chester Douglass) in no way negated these findings. The NAS committee was unsure about designating fluoride as a potential carcinogen in 2006 because we wanted to wait for the final study from the Harvard group. Now that it is published, nothing has changed (Kim FM et al. 2011, J Dent Res. 90(10):1171-6).
Researchers at Harvard recently conducted a meta analysis of 27 studies that examined fluoride in drinking water and IQ as an outcome. The results showed a CONSISTENT negative effect of fluoride in drinking water and an average downgrading of 7 IQ points (Choi AL, Sun G, Zhang Y, Grandjean P. Developmental Fluoride Neurotoxicity: A Systematic Review and Meta-Analysis. Environ Health Perspect. 2012 Jul 20)