You can fix a broken jaw at home if you are sure that the bone is not displaced. To do this, you need to take some time to find out whether the jaw is broken or not. If the jaw is broken, you should not try to fix it at home.
Unfortunately, there is no easy way to fix a broken jaw at home. If you or a family member have broken their jaw, it is best to see a doctor as soon as possible. The first thing they will do is make sure your airway is clear. Next, they will put a cast, splint, or brace on your jaw.