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The collar works for me!
RE: The collar works for me!
I think the mask type is also important in determining the need for a collar. When I was using a nasal cradle (Dreamwear), my AHIs were around 0.2-0.8. As I was mouth-breeding, I was looking for solutions for dry mouth and leaks and started using a full face mask (Dreamwear Full Face mask). My AHIs for the first few days with the full face mask jumped to 5-6. When I used a collar, they reverted to 0.2-0.5s. The fullface mask has  2 pairs of straps and the lower ones pull your chin in, narrowing the passage. The nasal one doesn't have anything pulling your chin. As a result, I need to use a collar if I wear the fullface mask. If I switch to nasal, I may not need it but it still helps.
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RE: The collar works for me!
Interesting about the lower straps pulling your chin in. I'll test that out.

I started using a collar with both my nasal pillows and my P30 airfit. My leak rate is way lower with the collar on the P30. I still mouth breathe, but less, with nasal pillows. so now, it's been the P30 and the collar with very low AHI.
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