My wife has had an awful time with her teeth. I wish I could afford to give her the smile she's always wanted. Not only does she have crooked teeth, they also formed without proper enamel so as to protect them, so she's just had so many problems with cavities and such. She takes good care of them, but they are just problems and growing up she was super self-conscious. She wouldn't smile much in order to hide them.
Her cheap ass parents took her to the dentist and the recommendation was braces. My wife wanted them but her mom took the dentist in the other room and talked to him. He came in and literally told her to push on her teeth with popsicle sticks to even them out. WTF?
So she never got them taken care of. Just a couple years ago we dropped a sizable sum on fixing cavities and a few other things. She might need a crown or two. Oh, and she just had the surgery to remove all four wisdom teeth at 37 years of age. It's hard enough to keep up with the expenses without the cost of braces or whatever. Maybe someday. I don't care myself, but I know that she does on some level, though we've talked about it numerous times and she seems pretty cool with it at this point and smiles beautifully instead of hiding.