Respiratory diseases may be caused by the ingestion of bacteria-laden drops of moisture from the mouth into the lungs. These ingested bacteria colonize the lower reaches of the lungs creating the opportunity for pneumonia and other respiratory problems.
As well, people with respiratory problems typically are exposed to a stressed or low-functioning immune system. This encourages a much faster build-up of periodontal disease which can aggressively attack the gums and teeth. The result is even greater stress on the immune system and greater opportunity for bacterial infection in the lungs.
The impact of periodontal disease on respiratory diseases cannot be overstated. Neither can the case of respiratory infection and a weak immune system.