start chewing alot of bazooka buble gum thats the hardest brand there is. When you do that drink ice water at the same time. That will give you a stronger jaw and chin so you can take more punishment.
Also work your neck muscles alot so that they become thicker and harder for people to submit you with chokes. You can actually buy a couple of extra secounds on a submition by doing that. Im serious chew bazooka buble gum all day if you can. Once you get poped in the mouth hard some times you cant fully close your mouth. Doing stuff like that now will help you later.
Also invest in a shock dr mouth peice not the random generic kind. Shock dr are better for absorbing blows. Also practice bitting on the moment of impact that lessens the hit a little.
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