Several studies looking at a possible link between water fluoridation and cancer have been published in recent years a partial report of a study from the harvard school of public health published in 2006 found that exposure to higher levels of fluoride in drinking water was linked to a higher risk of osteosarcoma in boys but not in girls. A possible relationship between fluoridated water and cancer risk has been debated for years the debate resurfaced in 1990 when a study by the national toxicology program part of the national institute of environmental health sciences showed an increased number of osteosarcomas bone tumors in male rats given water high in fluoride for 2 years . Fluoride linked to bone cancer in fed study fluoride appears to have caused bone cancer in rodents in a recently completed national toxicology progran ntp study and the chemical is now at risk of being classified a carcinogen according to internal documents and statements obtained from the environmental protection agency epa. After an animal study showed a possible link between fluoridated water and a type of bone cancer people became skeptical about the safety of fluoride in water. These studies were then set within the context of the societal benefits of fluoridation treatment programs the cancer bioassay of fluoride the broader scientific literature on fluoride as well as that of the ad hoc phs panel that was convened because of the cancer concern generated by unofficial reports that naf was a carcinogen
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