The purpose of this study is to compare the efficacy of two types of local anesthesia (articaine and lidocaine) for infiltration anesthesia during restorative dental procedures on lower teeth in pediatric patients. The patients will require similar dental operative procedures on both right and left sides of the mandible in order to qualify for this study. The study will require at least two dental appointments, where a randomized, cross-over study methodology will be utilized. All subjects will be treated by the same dentist. The comfort of the patient will be assessed at various points during the procedure using the Wong-Baker Faces Scale.