Habit reversal treatment for fingernail biting

A controlled experiment was carried out on 40 habitual fingernail biters to test the following: (1) Whether or not Nunn and Azrin's (1976) ‘habit-reversal’ programme could be simplified and still be effective. (2) Whether or not the use of a competing response is essential for successful outcome. (3) Whether or not a programme of ongoing goals can enhance outcome results.The subjects were equally divided into three experimental groups and a waiting list control group. The experimental groups were: habit reversal plus nail care; habit reversal, nail care plus programme of ongoing target goals; nail care instructions plus programme of ongoing target goals. The dependent variables were length of nails in millimetres and presence or absence of nailbiting. All experimental groups showed significantly greater increases in fingernail length than the control group, but there was no significant difference between the different treatments. However, at follow-up, the two groups incorporating ‘habit reversal’ showed much lower relapse rates than the other experimental group; thus, supporting the argument that use of a competing response is a key component in effective treatment of such compulsive, maladaptive habits.