I'm 19 and my top teeth are fairly straight. Would I just need braces for the bottom, or both? (Photo)

I do realize that I have somewhat of an overbite, and I personally think getting braces just for the bottom teeth would suffice and fix the overbite and straighten them up to complement the top. I'm not that well versed when it comes to the measures I should take in order to straighten my teeth, primarily the bottom.

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