How much roughly does your regular dentist cost for teeth whitening?

My teeth just seem to be naturally yellow, and it really sucks and I now hate smiling, I want to change it but I know it can be pricey, does any one know a rough price and whats the best to have done? x
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My dentist asks 500 euros = US$726 !!! She makes an impression of my teeth so that the strips fit perfectly... Still a lot of money
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