It has been studied over 500 cases of hypnotic susceptibility test and among them performed 15 cases of periodontal treatment under hypnoanesthesia. Conclusions were obtaines as following ; 1) The patients with chronic periodontal disease were surrendered more easily to the operator than those with acute periodontal disease. 2) bleeding was occurred much more than in drug anesthetic state and less in waking state. 3) The different depth of hypnotic state was needed to the different individual. 4) The post-operative pain did not occurred by the operators suggestion. 5. Those operation brought more rapid healing of wounds.