The teeth for which all-ceramic crowns are made need to be anesthetized with anesthetic once if they are living pulp teeth, and without anesthetic if they are dead pulp teeth, as follows. 1. Due to the mechanical properties of ceramics, the amount of all-ceramic crown restoration tooth preparation should be larger than metal porcelain crowns, in order to obtain enough space may make dentin tubules are exposed, while mechanical grinding process of heat production will also cause stress reaction of the pulp tissue, the patient will experience discomfort or pain, which may affect the completion of the tooth preparation, the application of local anesthesia to alleviate the pain. 2. If the affected tooth is a dead pulp tooth, no anesthesia is needed and the tooth preparation can be carried out directly. It is recommended to go to the hospital to receive regular professional treatment.