gingival retractor

例句：

1. 1.The dentist uses a gingival retractor to remove tartar from the teeth.
   牙医使用牙龈拉出器来去除牙齿上的牙垢。
2. 2.During the procedure, the dentist carefully manipulates the gingival retractor to avoid damaging the gum tissue.
   在手术过程中，牙医小心翼翼地操作牙龈拉出器，以避免损伤牙龈组织。
3. 3. The patient was given a gingival retractor to help him maintain proper oral hygiene during the recovery period.
   患者被给予一个牙龈拉出器，以帮助他在康复期间保持适当的口腔卫生。