Hey Christine, they suggested making an appointment to elevate the machine to the maximum and have a new mask made, I asked them why we didn't just elevate the machine I was sitting on to the max and seeing if it was going to work, especially since my tongue happen to be swollen and that's the only way we would know. They did and it didn't work. They said another alternative might be to lay on my stomach but the dose wouldn't be directed as accurately as if I was on my back. After I got home I started to think it through.and, in 16 treatments, I've had to miss three because of my tongue. If that trend continues I won't have missed many more than if I was having treatment around the Christmas/New years holidays. I realize missing doses does have an impact on the effectiveness of the treatment, but if I don't start to average missing any more than I have, I'll stick with what I'm doing. Thanks for your comments and your suggestions.