My hubby uses a cpap with a chin strap as he wears a nasal mask. He was having too many air leaks with a full face mask. Problem is, the chin strap does not keep is mouth shut. He has tightened it to the point he has marks on his face, and he is still leaking air out of his mouth. Told him I was going to tape his lips shut , but seriously, any ideas? The medical equip center and sleep lab have no ideas. I worry about him so much. He gets tired of it as much as I do. He has actually woken himself up from the sound of the air coming from his own mouth. Now thats bad! He is starting to resort to not wearing his mask because of his frustration. Help please~