Sudden cardiac arrest (SCA) is an uncommon event in dental practice; however, the frequency of dentists encountering SCA and other major medical emergencies is increasing. We report the successful resuscitation of a patient who developed SCA while awaiting examination and treatment at a dental hospital. The emergency response team was called upon, and cardiopulmonary resuscitation/basic life support (CPR/BLS), including chest compression and mask ventilation, was promptly initiated. An automated external defibrillator was used, which indicated that the patient's cardiac rhythm was unsuitable for electrical defibrillation. The patient returned to spontaneous circulation after 3 cycles of CPR and intravenous epinephrine. The knowledge and skill levels of dentists regarding resuscitation under emergency circumstances should be addressed. Emergency response systems must be well established, and CPR/BLS knowledge and training should be updated regularly, including optimal management of both shockable and nonshockable rhythms.