Case histories and peer reviewed research shows that fluoride can cause harm even at low levels. People can experience toxicity symptoms from drinking fluoridated water or using fluoride tablets. Symptoms include neurological problems, headaches, skin irritation, gastrointestinal pain and symptoms (nausea, vomiting, diarrhea, constipation) urticaria, pruritus, stomatitis, chronic fatigue, joint pains, and polydipsia (Waldbott 1956, 1958, Feltman 1956, Feltman and Kosel 1961, Grimbergen 1974, Petraborg 1977, Spittle 2008, reviewed by NRC 2006). Patients were often unaware that their drinking water contained fluoride. Symptoms improved with avoidance of fluoridated water and returned with consumption of fluoridated water or with experimental challenge with fluoride and confirmed by double blind testing. Doctors aren’t trained to suspect fluoride, so patients may be treated for side effects when all that is needed, is avoidance of fluoridated water. The Feltman and Kosel study was published in the Journal of Dental Medicine and received funding from the US Public Health Service, Department of Health Education and Welfare, Washington DC.