I'm wondering what to do about a crooked smile/lip? (Photo)

My lips are really chapped right now, so pardon their look! Anyway I was going to go to a cosmetic dentist to do something about the white spot on my tooth and my gummy smile. Then I got to thinking, I've always smiled crookedly. When my face is relaxed, my lips are perfectly even. It's when I smile that my upper lip goes up/my face contorts. What can be done for this? Can a cosmetic dentist fix this or would I need something more extensive to fix my crooked smile/lip?

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