- The K1 focuses on establishing nasal breathing and initial myofunctional habit correction. - It is soft and flexible, giving the best compliance while being adaptive to any arch form and malocclusion. - It has small breathing holes to establish continuous nasal breathing and myofunctional features to promote correct habits. - Move to the K2 when the K1 is staying in overnight and nasal breathing has been established. **For further product information, please contact Chat Support**