San Francisco's "Operation Headstart"; the impact of fluoridation.
D002675:Child, Preschool; D003731:Dental Caries / Q000453:epidemiology / Q000517:prevention & control*; D005457:Fluoridation; D006801:Humans; D014094:Tooth, Deciduous; D014481:United States; D014490:United States Office of Economic Opportunity