title: Etiology of periodontal disease.
mesh_terms: D000328:Adult; D000368:Aged; D000818:Animals; D018407:Bacterial Physiological Phenomena; D002648:Child; D003773:Dental Plaque / Q000150:complications / Q000382:microbiology / Q000517:prevention & control; D004285:Dogs; D006801:Humans; D008214:Lymphocytes / Q000276:immunology; D010510:Periodontal Diseases / Q000209:etiology* / Q000235:genetics / Q000276:immunology / Q000382:microbiology; D010519:Periodontium / Q000382:microbiology