Poor oral hygiene can increase colonisation with pathogens such as S. aureus or P. aeruginosa that can be aspirated into the lower airway, thus increasing the risk of pneumonia.

不良的口腔卫生会增加致病菌的定植，如金黄色葡萄球菌、铜绿假单胞菌等；这些致病菌会被吸入下呼吸道，从而增加罹患肺炎的风险。