"Root canal" is the term used to describe the natural cavity within the center of the tooth. The pulp or pulp chamber is the soft area within the root canal. A tooth's nerve and pulp can become irritated, inflamed, and infected due to deep decay. Eye twitching is a repetitive, uncontrollable blinking or spasm of the eyelid, usually the upper lid. Actually, a root canal does not often cause eye twitching unless the muscles around eyes are affected by a root canal, however, it is rarely. Eye twitching are topically caused by fatigue, stress and caffeine. In these cases, you need to stay fit and have a rest.