busterbaxter

See my above comment

The practice is called orthotropics. I can vouch for this user's experience myself, have had difficulty breathing for many years which led to poor teeth and a narrow palate. Once I received a palatal expander i realized how important it was to keep tongue pressure flat on the roof of the mouth. I practice regularly now and have seem improvements to teeth, breathing, and facing structure. It's a shame this stuff isn't taught more. You can find more details in this video: https://youtu.be/eh9OqEd5z1k