Does hydrogen Peroxide whiten teeth? I have heard it can, but is this safe for your gums and teeth?

I need my teeth whitened by next weekend.If this is not safe nor does it work please suggest what works and is fast and cheap.Under $20 preferably
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This is very unhealthy. It kills tissue, thats why it bubbles up like that, it likes to kill RBC. Nothing works that fast unless you it's done by a dentist.
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