Stop N Grow Nail Deterent End nail biting today. From the very first application, double acting Stop'n Grow will help you stop nail biting. The unique formula contains two powerful ingredients 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 acts as a constant warning when fingers begin to stray to the mouth. Within three weeks your nails will be longer & more attractive. Double acting Stop'n Grow is willpower in a bottle. Colourless & discrete Does not stain the nail or finger The formula produces a bitter taste to immediately prevent nail biting Bitter effect lasts even after washing, if applied once a day Helps to make nails longer & more attractive within 3 weeks. Can be applied over nail varnish Can also be used to help prevent thumb or finger sucking Stop'n Grow is not recommended for children under 3