Mavala stop helps stop nail biting for adults and children. Mavala stop helps stop nail biting for adults and children is a bitter-tasting product with the appearance of a colorless varnish. That helps break the habit of biting your nails and putting your fingers in your mouth or sucking your thumb. To use without or over your varnish. For children (3 years minimum) and adults. The effectiveness of the product may be compromised in young children. Because their taste is not fully developed and they may appreciate the bitterness. If you have already tried our product, please leave your opinion in the comments. Apply a layer of Mavala Stop all over the surface of the nail and allow to dry for a minute. Repeat the action every other day until the habit of biting your nails is lost.