title: Periodontal disease in three young adult populations.
mesh_terms: D000328:Adult; D003728:Dental Calculus / Q000453:epidemiology; D003731:Dental Caries / Q000453:epidemiology; D003773:Dental Plaque / Q000453:epidemiology; D003793:Dental Restoration, Permanent; D005891:Gingivitis / Q000453:epidemiology; D006801:Humans; D008297:Male; D009664:Norway; D010510:Periodontal Diseases / Q000453:epidemiology* / Q000209:etiology; D010514:Periodontal Pocket / Q000453:epidemiology; D013188:Sri Lanka; D014481:United States