Do you have a bad habit of biting your nails when you are frightened or depressed? To allow the nail bed to repair itself and look normal gradually, you have to stop biting the nails immediately. You can add biotin in your diet because it will not only help the nails to grow quickly, but it will also make them healthy. Avoid using glue-on fake nails because they make your natural nails weak. You can use nail polishes with little chemicals and use a clipper to cut your nails straight.