- The B3 has wider tooth channels to accommodate clear aligners and vacuum-formed retainers. - It focuses on continuing habit correction when patients are wearing clear aligners, but also retaining the correct habits when patients are using vacuum-formed or clear retainers. - It has small breathing holes to maintain continuous nasal breathing and myofunctional features to promote correct habits. - If the patient is using bonded lingual retainers, we recommend the T4A Phase 2 (large). **For further product information, please contact Chat Support**