It only takes 3 weeks and the success rate is 92%. The baby has given up the habit of thumb sucking since then. This treatment kit is a safe and effective way to help children get rid of the habit of thumb sucking. The sucking finger cot is made of soft, non-toxic silicone. It is safe for babies to use and will not limit the child's ability to play or cause any discomfort. Suitable for babies aged 1-4; older babies can also use it if the diameter of the thumb does not exceed 18mm. Make sure that there is a small gap between the child's thumb and the guard, which allows air to flow, making it impossible to suck. Although children can still put their thumbs in their mouths, there is no such kind of "sucking feeling" that will eliminate the habit of pleasure. Habits are broken naturally and gently. It is best to take it off when the child falls asleep at night and clean the kit with hot water every day. Product details Features: Do I need one for each thumb? If your child mainly sucks on one thumb, our research shows that they are less likely to start sucking on the other thumb after putting on the protective shield. However, if your child alternately sucks the right and left thumbs, indicating that there is little preference between the two, then you should consider having two guards to break the habit. Specification: Color: as shown in the picture. Material: Silicone color Package includes: 1 x Finger sucking stop (for thumb). Notes: Due to the difference in lighting and screen settings, the color of the product may be slightly different from the picture. Due to different manual measurements, please allow slight size differences.