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I have the same one, and I use a chin strap to keep my mouth closed - I've tried just using mouth tape, but I've found that the p30i straps slide around too much and that the chin strap gives it the friction needed - so maybe try that as an option?
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I use this one: https://smile.amazon.com/gp/product/B005HYTVEK
You could get a chin strap to force your mouth to stay closed while you sleep. I use a nasal pillow and when I initially started using my CPAP a couple years ago, I had the same issue. I got a chin strap and it fixed the dry mouth issue for me. Not a referral link, sorry for the long link: https://www.amazon.com/CareFusion-Ruby-Snoring-Strap-Large/dp/B005HYTVEK/ref=sr\_1\_6?dchild=1&keywords=Chin+Strap+-+PureSom+Ruby+Topaz+Adjustable&qid=1629840627&sr=8-6
Just search for "ruby style chin strap"
Here's one from Amazon.
CareFusion Ruby Stop Snoring Chin Strap Large - XL https://www.amazon.com/dp/B005HYTVEK/ref=cm_sw_r_cp_apa_i_4WfPCbMPJRC9P
If the one you ordered doesn't work, this is one I use. It's better than the other 3 I tried before it, and it's lasted a long time. I don't know that any of them are the be-all end-all, but they do help.
https://smile.amazon.com/gp/product/B005HYTVEK/ref=oh_aui_search_asin_title?ie=UTF8&th=1
Amazon — there are basically 2 styles.. you’ll see a resmed strap that is very simplistic (I ordered that one and then I ordered this cafe fusion brand one which is what I wore last night)
CareFusion Ruby Stop Snoring Chin... https://www.amazon.com/dp/B005HYTVEK?ref=yo_pop_ma_swf
ResMed CPAP Chin Strap https://www.amazon.com/dp/B00N44IL1O/ref=cm_sw_r_cp_api_2hyJBbM3P7VF7
This one:
CareFusion Ruby Stop Snoring Chin... https://www.amazon.com/dp/B005HYTVEK?ref=ppx_pop_mob_ap_share
I used with great success this one: https://www.amazon.com/gp/product/B005HYTVEK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
My head is pretty massive though, check the size.
I trained myself to breath only thru my nose. Took a few months with a chinstrap, called Ruby Red, although I don’t have a beard. Like this one which fit if you tuck the beard back or if it a small/medium beard: CareFusion Ruby Stop Snoring Chin Strap Large - XL https://www.amazon.com/dp/B005HYTVEK/ref=cm_sw_r_cp_tai_HGU2DbVNJMH6T
edit: I don’t have a beard
This is the best I've found for me. Carefusion Ruby Stop Snoring Chin Strap Large - XL
https://smile.amazon.com/gp/product/B005HYTVEK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
DO order the XL unless you've got a tiny head.