How can I afford Braces and orthognathic surgery?

I have an identical twin sister and we both have the same oral issues. My parents cannot afford anything, neither of them are covered by insurance either. My sister and I are very self conscious about our teeth, it's really affecting or self esteem. We wanted brace so badly since we little girls! Everyone has straight teeth and it's bot fair that because we can't afford it we can't have a great confident smile. We need braces and a lower jaw alignment, how can I afford this? help!! pls

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