The reason that you don't feel anything is because the pulp is dead (necrotic).
你没有什么感觉的原因就是因为牙髓已经坏死。
2
AIM: to raise the living rate of pulp after review of the permanent-front-teeth with root-fractured beneath the middle and improve the quality of root-tube-treatment to the deadpulp teeth.
目的：提高牙根中部以下根折恒前牙复位后牙髓的存活率和死髓后根管治疗术的质量。
3
The traditional pulp refining methods and their procedures for high dead-beaten pulp were introduced briefly.