The present invention is a system to kill bacteria on surfaces of teeth, gums, cheeks, and the tongue. The present invention is a system of creating and applying heat within the oral cavity to kill bacteria. As taught herein, the invention also applies heat within the oral cavity to kill bacteria underneath surface layers. Applying heat to a tooth penetrates to elevate temperature and thereby kill bacteria on and within tooth layers including enamel, dentin, pulp, nerve, apical foramen, periodontal ligament, cementum, and root nerve as well as in gun and bone tissues surrounding the tooth. The invention uses conductive heat energy and radiant heat energy.
