Nail biting is a very bad habit, which can worsen the appearance of your nails.   It is a clear enamel with a bitter taste that allows to maintain nails and their contour in good condition, by helping break the nail biting habit and avoid putting fingers in your mouth or thumb sucking. To use without or over your nail polish. How to use: Apply a coat onto the entire nail surface (or over polish) and allow to dry. Avoid washing hands directly after application. Re-apply every two days until the habit has stopped. Of course, before each re-application, remove Mavala Stop with Nail Polish Remover. For children (over 3 years old) and adults. With small children the efficacy can be compromised as their taste buds are not fully developed and they may like the bitterness of the product. Note : Dermatologically tested.