- The J1 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 large breathing holes to initially open the airway and a posterior air spring base that encourages exercise of the muscles of mastication. - Move to the J2 when the J1 is staying in overnight and nasal breathing has been established. **For further product information, please contact Chat Support**