title: Heterogeneity of periodontal diseases.
mesh_terms: D000328:Adult; D010520:Aggressive Periodontitis / Q000473:pathology / Q000503:physiopathology; D002648:Child; D005892:Gingivitis, Necrotizing Ulcerative / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D010518:Periodontitis / Q000145:classification / Q000473:pathology / Q000503:physiopathology*; D011627:Puberty