Here I presented a case orthodontically treated with four problematic first molar extractions and the patient benefits from a healthy dentition after treatment.

• 本病历报告中，藉由拔除四颗严重龋蚀的第一大臼齿，并搭配矫正治疗来缓解齿列拥挤情况并关闭拔牙的空间。