How much does it cost to get your teeth whitened at a Dental office?

I live in Canada..and was wondering if that is covered by dental insurance. I want my teeth white but not too white that it will look fake. And what would be the best over the counter whitening product other then that?
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Don't know about Canadian law, but in the US whitening is considered cosmetic, and is not covered. Depending on the system that's used, it can range from $200-$500.
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