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In contrast, the 2015 review by the Cochrane collaboration was more restrictive than other systematic reviews, using <br /> results from only nine studies that evaluated primary dentition caries following addition of fluoride to drinking water, <br /> and 10 studies that evaluated permanent dentition caries .43 Although it concluded that fluoridation led to a 35 % <br /> reduction in dmft and a 26% reduction in DMFT, it found that all studies had a high risk of bias . It also found insufficient <br /> evidence to determine the effect of stopping water fluoridation or the effect of fluoridation on dental health disparities . <br /> 2. 3. 5 Studies of fluoridation and dental caries in children reported since the 2015 Cochrane systematic review <br /> Several new epidemiologic studies of children have been reported since the Cochrane review, as summarized in Table 2 . <br /> Each study found dental caries preventive benefits associated with exposure to water fluoridation . Results therefore are <br /> consistent with the main finding of the reviews summarized above . <br />