I have had a bipap since 2018. I just recently added oxygen to it. I use a full mask because I am a mouth breather. I wear Dreamware by Resperonics. It wAs easy for me to to get used to it. It is the only time that I can breath easy. No more headaches in the morning. I do use Biotene mouth gel for dry mouth , it helps. I also use Burts Bees on my lips too. Sometimes I also use it during the day if I am really SOB. Love it.