One possibility in anaesthetics is the “electronic anaesthesia” (TENS). In this, electrodes are attached to the lip and mouth of the patient. The patient controls, by means of a lever, the amount of electric current to a point where he does not feel any pain, but only a slight tingling. This Transcutaneous Electric Nerve Stimulation is an electronic procedure for the treatment of pain. The TENS mechanism is simple, but extremely efficient. The transmission of pain information to the brain is inhibited.