Note: This is a first generation product. For the latest and most recommended treatment kit to stop thumb sucking, we recommend the TGuard AeroThumb, also sold on Amazon. It is redesigned to be more comfortable, and far more effective. Designed to be safe, fun, painless, and most of all, effective, TGuard ThumbGuard is guaranteed to stop thumb sucking by eliminating what makes it pleasurable: the suction that occurs when the child tries to suck his or her thumbs. This suction is the primary element responsible for pleasure, and is the sole reason why children cannot help but prolong this harmful habit. In order to break the suction, the soft, flexible, non-toxic plastic tube creates a channel for air to flow; which breaks the suction without causing any pain or discomfort. By breaking the suction, you are breaking the habit, and ThumbGuard does this safely and easily within 30 days. No more messy nail polishes full of chemicals, or fabric-based solutions that your child can remove; try a gentle, non-intrusive approach that parents, pediatricians, and dentists have recommended for over 20 years: TGuard ThumbGuard.