I had braces because of hitting my face on a rock in the mojave desert when I was age 2, knocking out 2 baby teeth (the right front one and the one next to that) and damaging (fusing) the developing permanent teeth there. When I was about 10 my front tooth finally came in (crooked), but the one next to it never did (since it was fused above the other one). Around the same time (can't remember if it was before or after) the eyetooth on that side fell out and never grew back (because the permanent tooth was stuck).
I got braces while I was on my mission. It was the suggestion of the mission president's wife. I had never considered it before, really. And the parents probably never considered it because of the expense. My teeth never bothered me but when it was suggested to me I said "sure, why not."
This involved getting an apparatus on the roof of my mouth with a little key I had to crank a couple times a day in order to widen my upper jaw. Cranking this hurt a bit but I was eager to get it over with as quickly as I could, so I did it more often than required. It seems it worked very well. (I never considered that I might accidentally widen it too much... eh heh heh.)
So I got all my teeth all straightened, with plenty of room for that tooth to come down, but it didn't cooperate. Finally after I got home from my mission they discovered that I had an odontoma there--a buildup of tooth material in my gum there, which was keeping the other tooth from coming down. Once I had the surgery and got a post attached to my permanent tooth, they pulled that tooth down over about a week. It went very easily.
So at last I was missing only one tooth. I decided to go for a bridge instead of a post.
Oh yeah, late in high school that front tooth that came in late and crooked had to have a root canal. It was fun. Believe it or not...