I use the Wisp. It made my gums and teeth hurt, too, for the first few nights that I used it. Not as badly as what you've mentioned, though.
The Wisp was the second mask that I tried. It was so much better than the first one, in spite of the sore teeth, that I kept it. I don't know if my body adjusted to it or if maybe I had the straps a little too tight at first, but the tooth soreness problem went away after a few days.
I have autoimmune arthritis and have had problems with TMJ in the past. My experience with TMJ and jaw pain in general is that it seems to be the effect of several combined factors (clenching the jaw, bad upper/lower teeth alignment, habits like gum chewing, etc.) This can mean that adding in a new stressor like a CPAP mask can cause a flare-up of pain.
I'm glad that the Dreamwear is working for you. That's the one that I want to try next.
Oh - I think it may also be possible that my Wisp mask frame was just too rigid when it was new. I started off using the size "L" nasal cushion, but it felt too large to fit in the space between my upper lip and nose, so I switched to the "S/M" cushion. That one was too small, so I eventually switched back to the "L" cushion. I have had one cushion replacement since then, about 3 weeks ago, but I did not notice any renewed teeth/gum pain.
So I'm not really sure if the original pain was caused by something that wasn't right or adjusted properly in the mask itself or if I just adjusted to it with time. I like the Wisp. It's low-leak and I can sleep on my side pretty well with it (some discomfort problems from the straps on my temples.)