牙周炎
Has a dentist ever told you that you have gingivitis or periodontitis? 有医生告诉过您，您有牙龈炎或者牙周炎吗？
Chronic infections, such as periodontitis, can play a direct or indirect role, they wrote. 他们在文章中写到，慢性感染，例如牙周炎，在发病过程中起到了一个直接或间接的作用。
