title: Periodontal diseases in children: disease heterogeneity.
mesh_terms: D002648:Child; D002675:Child, Preschool; D005882:Gingival Diseases / Q000473:pathology / Q000503:physiopathology; D005891:Gingivitis / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D010510:Periodontal Diseases / Q000145:classification / Q000473:pathology / Q000503:physiopathology*; D010518:Periodontitis / Q000209:etiology / Q000473:pathology / Q000503:physiopathology; D011627:Puberty