This is for habitual nail-biting or thumb sucking problem that needs attention. Harmless bitter taste will quickly remind anyone not to put their fingers in their mouth. Special formulation stimulates nail growth so nails can stay looking fresh and healthy. Works great for nail-biting or thumb sucking problems that need immediate attention. Brush on application can be used as top coat or base coat. Provides quick & easy remedy to ending that annoying nail biting habit for both adults and children.