From the first application, double acting Stop 'n Grow will assist you stop nail biting. The distinct formula consists of 2 powerful components to make it doubly effective. Stop 'n Grow produces a very bitter taste to stop you biting your nails immediately. It's strong bitter taste functions as a constant warning when fingers start to stray to the mouth. Within three weeks your nails will be longer and more attractive. Double acting Stop 'n Grow is self-control in a bottle.