It's hard to pick only one.

But if I had to pick only one, it would be one that I couldn't fix on my own.

I plan to get braces. I never had straight teeth, and I'm missing the two teeth that go next to your top front teeth (but I have the next two instead sitting next to my two front teeth). My parents could never afford braces, and for the longest time, I've been disabled and/or the working poor, so I've not been able to afford braces either. I will be able to afford braces in the future, but I was told by many consultations that I should have two teeth pulled on the bottom to remove the crowding, and then move the one tooth up and over to straighten them, and then to later file down the teeth next to my front teeth, so they look like the teeth that would normally go there.