Nail Quail's Strong Will is designed to stop the nail biting habit to help regain confidence, comfort, and nail health. This intensely bitter formula has no sheen or smell and is derived from natural ingredients. Strong Will can be used on fingernails, cuticles, skin, and any other affected areas, and is safe to use on top of conventional nail polish and other nail applications. The click-pen applicator makes for quick and easy one-handed application. The on-the-go size allows it to fit discreetly into pockets and bags, so its always with you should you need some extra Strong Will. Due to the intensely bitter nature of this product, it is recommended for children aged 4+, as well as adults of all ages. Nail Quail - Strong Will Anti-Nail Biting Click Pen, 7ml, Made in USA