When i was a kid many moons ago, My parents were told I should have braces on my bottom teeth, well they probably could not afford it and not many people bothered then, so I have crooked bottom teeth, but they are not that bad, my tops are very straight and look fine, and besides you hardly ever see the bottom ones.

Unfortunately today, nearly every child is told by the School Dental nurse they need braces, I think it is purely cosmetic.
my daughter has straight bottom and top teeth, but they suggested she see an orthodontist, what for I don't know? she has a under-bite I think they call it.

I simply donot have the money for that, if it were to cause her discomfort or anything, then yes I would find it, but sometimes I think they refer nearly everyone these days, and its un-necessary.

My sisters two front teeth cross over each other, now to my way of thinking she should have had that sorted, it spoils her smile.