What can I do to correct teeth show when smiling? (photos)

The right side of my smile exposes my teeth strangely when I smile but the left side of my smile is normal. The 1st picture shows the right side of my smile. The 2nd picture shows how I'd like it to be. The 3rd picture shows the left side of my smile. I have straight teeth, but not sure what's causing this. I don't know what could treat this (if there is any treatment at all) to get it like the 2nd pic. It's been like this almost my entire life, so not a new thing.