Jaw masseter help required. (photos)

I started chewing gum to make my face more square and im a primary right side chewer. My right masseter has gotteb bigger than my left masseter. I dont want botox because i love my right side. How do i make my left masseter as big as my right one? Is such a thing even possible since no matter what i do, my right jaw will get engaged alittle bit even if i chew on my left side. Will i really need surgery? Are there any exercises for one side of masseter? Thank you

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