Is there a solution for an asymmetrical mouth?

Hello, I'm 23 years old, I discovered this problem in the last 2 years only and i do't know if it's older than that. My mouth is normal in the neutral expressions. but when I smile or even talk, my lips are pulled upward in the left side more than the right. I don't know if there's any non surgical treatment? does contracting my muscles voluntarily in the left side while i'm talking or smiling would help me in the long term? Thank you. :)