An Inconvenient Tooth: The story of the water fluoridation controversy which has arisen from moral, ethical, political and safety concerns regarding the fluoridation of public water supplies. The controversy occurs mainly in English-speaking countries, as Continental Europe does not practice water fluoridation. Instead, fluoride is added to most table salt in Europe. Those opposed argue that water fluoridation imposes ethical issues, may cause serious health problems, is not effective enough to justify the costs, and has a dosage that cannot be precisely controlled.