@IAMAL_PHARIUS Indeed, every since I assumed proper tongue posture I've also been sleeping well and my jaw looks broader just because of the cheeckbones, the upper U of your face.
youtube.com/watch?v=VtrJWHjma1o
This dude is also an example himself, as he started as he entered/finished college, if you look around you can find pictures of how he was then and see the difference.