 So you press your whole tongue against the roof of your mouth, keep your lips together, breathe through your nose and maintain a straight posture. They also have like metal things that they sell that you can put in your mouth and all do this. But in case you're wondering who's behind this trend, I thought this was fascinating. Ninety five year old orthodontist by the name of John Mew. That's right. John Mew. So the next time you have a teenage guy, they're like trying to get their their little jaw chiseled. You can say, you know what? That's because of John Mew.