齿科医术

例句：

1. 1. The dentist performed a root canal on my tooth.
   牙医给我的牙齿做了根管治疗。
2. 2. He is an expert in the field of orthodontics.
   他在正畸学领域是个专家。
3. 3. Orthodontic treatment is essential for maintaining good oral health.
   正畸治疗对于保持良好的口腔健康至关重要。