Nail polish can mask damaged or disfigured nails. There are 17 principal nail polish finishes: Nail polish remover is an organic solvent that may also include oils, scents, and coloring. Nail polish remover packages may include individual felt pads soaked in remover, a bottle of liquid remover used with a cotton ball or cotton pad, or a container filled with foam into which one inserts a finger and twists it until the polish comes off. Choosing a type of remover is determined by the user's preference, and often the price or quality of the remover. The most common remover is acetone. This
Nail biting disorder (21%). It is also more common among children and adolescents with obsessive–compulsive disorder. Nail biting appeared in a study to be more common in men with eating disorders than in those without them. The most common treatment, which is cheap and widely available, is to apply a clear, bitter-tasting nail polish to the nails. Normally denatonium benzoate is used, the most bitter chemical compound known. The bitter flavor discourages the nail-biting habit. Behavioral therapy is beneficial when simpler measures are not effective. Habit Reversal Training (HRT), which seeks to unlearn the habit of nail biting and possibly replace it