Hi @jal333, I also have obstructive sleep apnea but it's not due scar tissue. Actually obstructive doesn't refer to scar tissue according to Mayo Clinic -- "Obstructive sleep apnea occurs when the muscles that support the soft tissues in your throat, such as your tongue and soft palate, temporarily relax. When these muscles relax, your airway is narrowed or closed, and breathing is momentarily cut off. Obstructive sleep apnea is a potentially serious sleep disorder.Jun 5, 2019" -- Obstructive sleep apnea - Symptoms and causes - Mayo Clinic: https://www.mayoclinic.org/diseases-conditions/obstructive-sleep-apnea/symptoms-causes/syc-20352090

I'm a mouth breather also and use a full face CPAP mask. I also have a deviated septum but the sleep medicine doctor said it isn't the reason for my sleep apnea but I've always been curious about if it plays a part in my obstructive sleep apnea.