title: Epidemiology of oral diseases--differences in national problems.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003625:Data Collection; D003731:Dental Caries / Q000453:epidemiology; D003753:Dental Health Surveys; D006801:Humans; D008875:Middle Aged; D009059:Mouth Diseases / Q000453:epidemiology* / Q000517:prevention & control; D012107:Research Design; D014944:World Health Organization