Nailine Bitter helps prevent nail biting. The powerful bitter taste, which lasts for several days, combats nail biting, promoting healthy, strong nails. It is resistant to hand washing and can be used directly on nails or over nail polish. Additionally, Nailine Bitter provides an effective treatment that helps keep nails hydrated and flexible. Contains Vitamin E and Calcium Pantothenate, which provide hydration and are antioxidants. Contains UV filter to prevent discoloration and yellowing. Directions for use: External use.\ Apply one or two coats directly onto the nails or over nail polish twice a week until the nails return to their normal state.