It only takes 3 weeks and the success rate is 92%. From then on, the baby gives up the thumb-sucking habit. This treatment pack is a safe and effective way to help your child break free from thumb sucking. Sucking finger cots are made of soft, non-toxic silicone.It is safe for infants and will not limit the child's ability to play or cause any discomfort. Suitable for babies aged 1-4; babies with a thumb diameter not exceeding 18mm can also be used. Make sure there is a small gap between your child's thumb and the shield to allow air to flow so that it can't suck.While kids can still put their thumbs in their mouths, there's no "sucking" that kills the pleasure habit. Habits are broken naturally and gently. It is best to take it off at night when the child falls asleep and wash it with hot water every day.Product Details Features: Do you need one for each thumb? If your child mainly sucks one thumb, our research shows that they are less likely to start sucking the other thumb when the shield is on. However, if your child alternately sucks his left and right thumbs, indicating that there is little preference between the two, then you should consider having two guards break the habit.Specifications: Color: As shown. Material: Silicone colorPackage includes: 1 x Finger Suction Cup (for thumb)