Nail biting is a nervous habit, which can rapidly become uncontrollable. Mavala Stop has a bitter yet harmless taste and the appearance of clear enamel. It helps to break the nail biting habit and thumb sucking. Works for children (more than 3 years old) and adults. Mavala specialise in the maintenance of beautiful looking nails and offers a complete range of products to alleviate all nail concerns, from uneven nail surfaces, splitting and flaking due to lack of hydration or nail discolouration, there is sure to be a Mavala nail care solution to suit you. Mavala is the world leader in nail care with a heritage spanning over 50 years. Created in 1958 by MAdelaine VAn LAndeghem. How to Use:Apply a coat over the entire nail (or polish) and allow to dry. Repeat the application every two days. Continue the treatment until nail biting has ended.