I was punched in the face, and my smile isn't straight now. Is it because of swelling? (Photo)

Will it return to normal eventually? I want to know, in case I have to go and get it corrected somehow. It doesn't look that swollen, so that's why I'm doubting that it's swelling. Does it always have to be the swelling causing this? Or could it be something else, perhaps bruising in my mouth. Should I go to a dentist perhaps? Any answers would be great, thank you in advance.