Trigeminal nerve is one of a pair of nerves that connects to the mouth, teeth, face and nasal cavities. Trigeminal neuralgia (tic douloureux) is a disorder that causes episodes of intense, stabbing, electric shock-like pain in the areas of the face where the branches of the nerve are distributed - lips, eyes, nose, scalp, forehead, upper jaw, and lower jaw. Something as simple and routine as brushing the teeth, putting on makeup or even a slight breeze can trigger an attack resulting in sheer agony for the individual. It is universally considered to be the most painful affliction known to adult men and women.