An acquired behaviour pattern regularly followed until it has become almost involuntary: e.g. the habit of looking both ways before crossing the street. The human being is a creature of habit. Most are good habits such as that shown in the example above, some are destructive, such as nail biting or bruxism (grinding of the teeth). Hypnosis can be used to investigate how the behaviour was learnt in the first place, confront that learning as unhelpful/unwanted and subsequently to select more appropriate forms of behaviour in place of the habit.