Literature from the early 1940s described the low fluoride concentrations in water, e. g. less than 0.1 mg/L, as related to relatively high levels of dental caries and teeth decay. Since then it has been a common understanding that a certain level of fluoride concentration in drinking water is beneficial to human from an oral health point of view, to the extend that fluoridation of water was proposed and even practiced in some places. Major environmental, toxicological and practical concerns were also raised and fluoridation of water never became widespread. Later it was established that the beneficial effect of fluoride on teeth is post eruptive and could be achieved through fluoridation of tooth paste and further other topical applications under certain circumstances. This renders the fluoridation of water superfluous.
Written by Eli Dahi March 2009