How to fix asymmetrical jaw

[sub5loserr]

My jaw looks like i got punched hard on one side of my face.

 

[vmtb]

It's often not directly related to your jaw muscles, but try training your weaker side. It's often related to your shoulders. If one of them is down or weak, or if you have scoliosis, try to fix that. Also train your neck muscles in general. Make sure everything is equally strong and it will improve over time. This also applies to sleeping. Try sleeping on the other side.