How to fix my slanted teeth and bite? (photos)

I am 24 years old and I have my brcaes for almost 4years now! My upper teeth are slanted its weird when I talk and smile I don't understand they're perfect U shape but they're not okay as you can see them on the pictures and my lower teeth front they're like coming out what could be the problem? Is it my dentist that doesn't know how to fix them? I go to my dentist regulary.

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