The natural history of periodontal disease in man. Tooth mortality rates before 40 years of age.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D004522:Educational Status; D006801:Humans; D008297:Male; D009664:Norway; D010510:Periodontal Diseases / Q000453:epidemiology* / Q000473:pathology; D044469:Racial Groups; D012959:Socioeconomic Factors; D013188:Sri Lanka; D014070:Tooth / Q000473:pathology; D014080:Tooth Exfoliation / Q000453:epidemiology*