 The average injection time for each cartridge was approximately 2 minutes. Ten minutes after the IAN block, subjective lip anesthesia will be evaluated by asking the patient whether hisher lip was numb. Thereafter and immediately before the pulpectomy, the electric pulp stimulations will be repeated to determine pulpal anesthesia. During the pulpectomy procedure, the patients were instructed to report any painful discomfort. To evaluate the intensity of pain during the pulpectomy, a verbal analogue scale will be used: 0, no pain; 1, mild, bearable pain; 2, moderate, unbearable pain; 3, severe, intense, and unbearable pain. The anesthesia will be defined as successful when the dentist accessed the pulp chamber without pain being reported by the patient pain scores 0 or 1. In these cases, the pulpectomy will be continued. Pain scores of 2 or 3 will classified the IAN block as unsuccessful. 