牙周炎
Has a dentist ever told you that you have gingivitis or periodontitis? 有醫(yī)生告訴過您，您有牙齦炎或者牙周炎嗎？
Chronic infections, such as periodontitis, can play a direct or indirect role, they wrote. 他們在文章中寫到，慢性感染，例如牙周炎，在發(fā)病過程中起到了一個直接或間接的作用。
