dentinal tubule

例句：

1. 1. The dentist removed the tooth and replaced it with a dental implant.
   牙医拔除了这颗牙齿，并植入了一个假牙。
2. 2. The patient's teeth were extracted due to severe decay.
   由于严重蛀牙，患者被拔掉了牙齿。
3. 3.The dentist explained the procedure of root canal therapy to the patient.
   牙医向病人解释了根管治疗的步骤。