title: The relationship between periodontal diseases and respiratory diseases.
mesh_terms: D003773:Dental Plaque / Q000150:complications* / Q000382:microbiology; D006090:Gram-Negative Bacteria / Q000472:pathogenicity; D006801:Humans; D010518:Periodontitis / Q000150:complications* / Q000382:microbiology; D018410:Pneumonia, Bacterial / Q000209:etiology*; D029424:Pulmonary Disease, Chronic Obstructive / Q000209:etiology*