Occurrence of nonfluoride opacities and nonfluoride hypoplasias of enamel in 588 children ages 9 to 14 years
Nevitt, G.A.; Frankel, J.M.; Witter, D.M.
Journal of the American Dental Association 66: 65-69
Enamel opacities or hypoplastic enamel occurred in 14.6% of the teeth of children where the communal water has a very low fluoride content. This percentage may be reduced by raising the fluoride content of drinking water to an optimum level. A baseline determination of such enamel conditions should be added to the DMF indexes in studies made previous to start of fluoridation programs.