how much would it cost to get your teeth whiten by a dentist?
It depends on how you're doing it. You can buy strips or gels at the store and do it yourself ($15-$55), you can go to the dentist and get bleaching trays from him (a couple hundred), or you can go to the dentist and have the whitening done in-office ($500-$1,000 for the whole mouth).
There's a website, CostHelper.com, with cost information on all kinds of stuff.
Teeth Whitening --
http://www.costhelper.com/cost/health/teeth-whitening.html
Billings Cosmetic Dentistry MT | Low Cost Teeth Whitening In Billings