What treatments can I undergo to correct my uneven smile? (Photo)

I have read extensively about facial muscle atlas and attempted facial exercises to correct my problem, alas. As you will see in the photo above, my zygomaticus minor and major seems considerably weaker on the right side of my face. I do realise uneven teeth potentially exacerbate the issue, but are not the fundamental cause. I am curious to know about treatments for facial asymmetry and costs that may be involved. I appreciate any and all feedback given. Many thanks in advance.

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