If your teeth have gone bad, and you need some major dental work or repairs, usually it's time to think about getting dentures, rather than repairing the bad teeth.
There are so many different types of braces these days, including invisiline, which is unnoticable, so there's no excuse for bad teeth. Also, just whitening them may help.
Always consult a dentist. Once teeth are to the point where their considered "extremely bad" its dentist time. Braces and whiteners will be used depending on the problem of course.
