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Dry mouth
Dry mouth
CPAP since 2012, currently Respironics BiPAP or Resmed VPAP (I have two machines), 15-25 CmH20, AHI average < 2.0, always under 5.0.

I have long had a problem with mouth breathing, or so I thought. For a long time I used a chinstrap (homemade), and it helps, but for the past year or so I have been experiencing dry mouth even though the chin strap is working well and leaks are normal. In fact, when I wake up in the middle of the night my mouth is dry, but my mouth is completely closed.

It seems to me that the problem is not mouth breathing but, rather, inadequate flow of saliva.

I have a (possibly) related problem with tears. My tear ducts don't work properly. Allergies bring on tears, but the tears do not drain from the eyes. All day long I am constantly daubing tears out of my eyes.

I don't know if the problem with tears is related to waking up with a dry mouth. Ducts for tears and saliva work a lot the same. They both involve fluid movement, so there may be a connection.

Any ideas or suggestions?
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RE: Dry mouth
I too have experienced both. A certain amount of dry mouth is unavoidable because saliva is pressure driven and applying pressure from a cpap will reduce the ability to get sufficient saliva. Combine that with the drying effect of mouth leaks, and you get severe dry mouth. 

As for the eyes, that can be an eye problem. There are “drains” in the eye that remove excess tears and they can be plugged. My wife had tubes inserted into the eyes to solve that problem. It is a very simple and painless fix.
CPAP is a journey like “The Wizard of Oz”. It’s a long slow journey. You will face many problems and pick up many friends along the way. Just because you reach the poppies, it doesn’t mean you are in Kansas. 
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