The estrangement of the ego from the superego in adolescence has several causes, such as the increase in instinctual demands and the activation of infantile wishes. Through identification the ego strives to combat regressive tendencies. This identification can interfere with reality testing and growth of the ego and can complicate treatment; there may ensue a less flexible adaptation. A strong identification with the therapist can, however, be used to enable the patient to test reality better, rather than be used in a frontal assault on the infantile wishes. Such ego strengthening is often necessary in the treatment of the adolescent.