r/u_EngineDefiant6418

Please I need some advice from anyone is using or did use a chin strap. I can't use full mask and for now I am using resmed p10 and I am very happy with it but I can't keep my mouth closed all night long. I bought biron Philips Respironics Premium Chinstrap. But this mask isn't what is supposed to do. So please I would appreciate some guidance.