[Evaluation on the effects of water defluoridation measures in China. Research Group Evaluation on the Effects of Water Defluoridation Measures in China].

In order to find out the situation of management and application of water defluoridation measures, as well as the effects on the prevention of endemic fluorosis in 10 provinces and cities with heavy endemic fluorosis from the drinking water sources, 1960 water engineering projects accounting for about 10% of all projects were investigated. The authors applied uniform method, criteria and forms to carry out the retrospective investigation. The data were entered into the computer database and analyzed statistically. The results demonstrate that all the defluoridation projects have significant effectiveness on the prevention of endemic fluorosis. The concentrations of water fluoride were below 1 mg/L. The prevalences of dental fluorosis were 30%-40% and the main type was light dental fluorosis. But with the time prolonging, less attention has been paid in man.