Anaeject® is an electric injector which was recently designed to control the injection speed in order to reduce pain during local anesthesia. An electric music can also be played to comfort the patient during the procedure (melody mode). The purpose of this investigation was to clinically verify the efficacy of Anaeject® using Scandonest®, a local anesthesia was given to 49 young patients (20 boys, 29 girls) using Anaeject® and Scandonest® prior to dental treatment. A questionnaire survey was collected from these patients. The average dose of Scandonest® was 0.9ml during the average treatment time of 19 minutes. Few patients complained of pain or discomfort during and after treatment. Majority of the patients felt less pain and fear from local anesthesia compared to a manually operated injector. Based on these findings, it was suggested that local anesthesia using Anaeject® and Scandonest® was useful and effective in daily pediatric dentistry.