Can facial symmetry be corrected in adults?

I've had noticeable assymetry from birth. My nose and mouth pull to my left side and my left side of face is shorter and flatter, jaw and cheek less developed. Also my ear on the right is smaller. As I have had orthodontics twice, and the results from three years ago have left my face looking more flat, in wandering what could be done, and roughly what would the cost be? Thanks.

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