it doesnt. I use a resmed p10 as well as the nuance pro both nasal pillow masks. I searched long and hard for a solution to keep mouth leaks from happening and I was excited to try this strap and it works. I am still new to using my cpap and have only been using for about 8 weeks. I hate the full fa...

I was having the same issue and found this on amazon. it holds chin up as well as covers mouth. I roll my lips inward and then cover my lips and it keeps my mouth from opening due to jaw dropping as well as keeps my lips from sputtering air out. May not be for every one but i love it. https://www.am...