DRY MOUTH --- While not perfect this procedure has helped me. My BiPAP is set as 21/15 (Pressure in/pressure out). Ever since I moved from a CPAP to a BiPAP I have suffered from DRY MOUTH. MY SOLUTION --- 1. I use NASAL PILLOWS (successfully) 2. I usually use #2 on my humidifier (if I use a higher setting it usually runs out of water) 3. I use a cheap cervical collar (tried a chin strap but had no luck) 4. Sometime I also tape my mouth shut with 3M Microspore Tape 5. I use 2 OraCoat XyliMelts when I go to sleep! 6. Since I use a diuretic (I am 76) I need to get up twice during the night to empty my bladder. The XyliMelts are usually melted and I insert another one each time I get up. The collar, tape and XyliMelts (mint flavored or plain) are all available at Amazon.com. Give it a try!