I have been using this mask for well over 2 years now and my bottom teeth have gradually moved out of position in the front. I switched to the Ultra mirage FFM using Macks silicone earplugs for a more comfortable, leak free fit. I have heard of some wearing the mask under their chin, which I have tried and it didn't work for me, but it changes the pressure to lower on my head not affecting my teeth. I am sure this tooth shifting does not happen to every one, but I would advise those using the FitLife to be aware of the possibility.
Off topic, but I'm glad to see so much action on the board. Many thanks to those posting.
Mary
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