If I'm going to be honest, I don't take super great care of my teeth, yet my teeth are naturally all super straight and are in pretty good condition, considering. I think that might actually be part of the reason that my tooth care isn't what it could be. Like how girls who're naturally hot, tend to dress super boring, while chicks who fall more in the middle of the bell curve of traditional beauty, actually dress really cool.
For some reason it doesn't work that way for guys though; if a guy knows he's not attractive he'll just roll with it, but dudes who think they might even have a modicum of swag become desperate not to lose it at any cost.
There are exceptions to the rule of course, like me! I just have great teeth that make up for everything else. (But for how long?)