Facial asymmetry problem. Jaw seems to have 'shifted' towards left. Any suggestions? (photos)

My right side of face seems to be flatter than my left and it seems to be 'sliding' towards the left. I used to sleep on my right side for 1 year at a stretch and used to avoid chewing with my right side. Also, when I touch my tongue to my upper palate, then it feels as if my upper gums and palate has 'tilted' towards the right side and my 'middle line' on the upper guns has shifted towards the right. What's the possible reason behind my facial asymmetry and can it be corrected?

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