index of gingivitis

例句：

1. 1. Hewas diagnosed with gingivitis andneeded to see a dentist.
   他被诊断出患有牙龈炎，需要去看牙医。
2. 2. Gingivitis is often caused by poororal hygiene.
   牙龈炎通常是由于口腔卫生不良引起的。
3. 3. People who smoke are more likely todevelop gingivitis.
   吸烟的人更容易患上牙龈炎。