I am 21 and suffer from overbite.i went to a doctor 6 years ago, had treatment for two years but ignored retainers. (photos)

My upper teeth are way down and I hate my gummy smile plus my lower teeth are crooked and when I open my mouth the teeth are still too close to each other.. . I want to get rid of this overbite and move my upper and lower teeth as away as possible...... What to do?

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