My jaw gradually moved to the side and I can't chew properly. What's the best treatment?

If I put my teeth so line between my first upper teeth and line between my first lower teeth are aligned, my upper and lower teeth touch only on one place and I can't chew like that, so over years my jaw moved to the side (looks horrible, yes). What I was wondering is when my dentist says to bite, should I bite the way I chew, or bite the right way, the way it was and will that affect the treatment?? Treatment as in braces I'm currently wearing?

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