title: The role of bacteria in periodontal disease.
mesh_terms: D005881:Gingiva / Q000382:microbiology; D005883:Gingival Crevicular Fluid / Q000382:microbiology*; D005891:Gingivitis / Q000382:microbiology*; D006801:Humans; D010510:Periodontal Diseases / Q000209:etiology*; D010519:Periodontium / Q000382:microbiology*