The term “habit disorders” includes thumb sucking, nail biting, hair pulling and tics (such as shoulder, head and elbow jerks, eye blinking, twitching or squinting of the eyes and jerking of the mouth and cheek). According to the DSM IV, Tourette Syndrome (TS) patients exhibit both motor and vocal tics that wax and wane and change in topography over time, the symptoms must have been present for at least 1 year, with no tic free period of longer than 3 months, cause marked distress or significant impairment in social, occupational or academic performance and the symptoms are not due to the direct physiological effects of a substance such as a stimulant or a general medical condition.