Bite Ender? is a safe fast and effective formula to break the nail biting habit. Our salon-tested formula has a harmless and very bitter ingredient that will help discourage habitual nail biting and promote nail growth. Directions: For best results apply to the entire nail surface twice a week. You can safely apply your favorite nail polish over Bite Ender? however for maximum effectiveness we recommend using without polish. To remove Bite Ender? clean entire nail with nail polish remover.[]