Whitening Help! My teeth are really really yellow, I'm in high school, and I need to have them whitened well -?

in under a week- for under $200. Does anyone know of any whitening stuff that works on everyone?
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Brush 2x a day with baking soda and peroxide(mix together to form a paste),then rinse and brush with toothpase(crest) followed by wearing crest white strips for at least 15 min.repeat daily.If this dont work,which it should then you may need a dentist for teeth whitening,its expensive though.
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