I've been using a nasal pillow mask since I started CPAP therapy three years ago on my original machine, a RemStar. Even though I'm using a nasal mask, my mouth would dry out within a few minutes, so I started using Biotene or Stoppers spray at bedtime. These provided enough moisture until I fell asleep and either didn't notice or the humidifier warmed up enough to deliver moistened air. Now that I switched to the ResMed S9, the dry mouth is more of a problem. The humidifier is using water, so I know it's working. I'm using the ClimateLine hose and the "auto" setting. I started with a temperature of 80 but slowly worked up to the maximum, 86 degrees. That's comfortable, but didn't do anything to help the dry mouth. Frankly, I don't know why my mouth gets dry with a nasal mask (yes my mouth stays shut)! I'm wondering if the S9 humidifier takes longer to get up to temperature than the old machine. Has anyone else had this problem with the S9?