My 4 year old daughter sucked her finger constantly, daytime and at night. Her dentist told me that she really had to stop thumb sucking or she risked permanent pallet damage that will cost a lot to fix later. Her mouth was already shaping around her thumb. The dentist told us about the Nipit and said it is the best product available. Our daughter loved the cute colorful design and willingly cooperated, and the motivational program and calendar and stickers all worked brilliantly! After three weeks we declared victory!! THANK YOU Nipit!