I'm a Boxer: How can I get my mouth to open normally?

I am a boxer and been doing it for about 6 years recently my jaw has been clicking and locking I went to the doctors and they assigned me to the maxifacial unit then they passed me in to a dentist I got given a mouth guard for when I sleep to go on my bottom teeth, since I have worn it the clicking has stopped but no my mouth slants over to the left when I open my mouth and it hurts when I eat something hard

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