http://www.cochrane.org/CD010856/ORAL_water-fluoridation-prevent-tooth-decay Be sure to read the Author's Conclusions: Summary: “There is very little contemporary evidence … that has evaluated the effectiveness of water fluoridation for the prevention of caries." "There is insufficient evidence to determine whether water fluoridation results in a change in disparities in caries levels across SES (Social Economic Status)." "We did not identify any evidence ... to determine the