Why is my smile uneven and crooked? (photos)

I feel like my smile is never even and the right side of my smile goes downward on the corner instead of up like the left side. I just recently started noticing this in pictures, when I laugh, and even just talking. It really is bothering me and I am not sure why it's like that. I know not everyone's face is symmetrical, but am just wondering why it would do that.

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