Hypnotherapy is a valuable technique that aids in treatment of some patients.  Adequate knowledge in this field could help dentists and specialists to profit from this treatment in very anxious patients. Current limitations of general anesthesia have led to restrictions in using this technique for treatment of dental patients. In recent years, hypnosis has gained much interest in medicine, psychology, and dentistry. The aim of this study was to evaluate the theory and background of hypnosis and its clinical application in dentistry.