What type of treatment for my crooked teeth? (Photo)

I've had braces before but the dentist didn't do a great job. Could my uneven front teeth be fixed by shaving them to the same size? When my mouth hangs open all that is visible are the two front teeth. Is it possible to lift them higher up so that my upper lip covers part of them when my mouth is open and that my gums are not visible when I smile?

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