- Myosa for TMJBDS S3 Moldable is made from medical grade silicone and is designed for patients who are partial nose breathers or who have progressed from the S1 appliance. - The S2 appliance works by advancing the lower jaw and opening the bite, which has the effect of opening the airway. - The smaller breathing holes at the front of the S2 optimizer breathing regulation by further encouraging nasal breathing. - This is the default appliance worn during the day. **For further product information, please contact Chat Support**