free gingiva

例句：

1. 1. The dentist advised the patientto free his/her gingivaregularly.
   牙医建议病人定期清洁牙龈。
2. 2. Freeing the gingiva canhelp reduce inflammation and improve oral health.
   清洁牙龈可以帮助减少炎症并改善口腔健康。
3. 3. During the cleaning, the dentist carefullyremoved the plaque from the patient'sgingiva.
   在清洁过程中，牙医小心地从患者的牙龈上去除牙菌斑。