What procedures are best for me to get a symmetrical mouth (laugh)? (Photos)

Hello, I'm 23 yrs old and I really don't like my smile/facial expression when I smile or talk because i notice the left side of my mouth doesn't work quite as well as the right side. The left corner is more drooping and doesn't go up like the other corner. Also there's a muscle right next to my mouth and it gets bigger (again on the left side) when I smile/talk...what I don't like about this is that the left side of my face (cheeks) look fuller.

No doctor answers yet