Root canal procedures may further weaken your tooth. Besides, the tooth's structure may not always allow removing all of the intoxicated pulp from the canal. Your dentist must be experienced enough and have the required advanced equipment to do a good job. If not, you face the risk of reinfection. In addition, the seal may erode or leak with time, requiring you to see your dentist again. Besides, some people are allergic to local anesthesia.