When it's time to get our teeth checked, most of us trust our dentist to determine the treatment plan and how much it will cost. They are the experts, aren't they? Co-host Erica Johnson puts dentists to the test: how does one know for sure what work needs to be done and how much it should cost? We reveal that dentists themselves can't even agree. In Money Where Your Mouth Is, we send a researcher with hidden cameras to 20 different dentists in Toronto and Vancouver. We want to know: what treatments are recommended for her pearly whites? We discover a wide variation in treatments and costs. It seems dentistry is not that black and white after all -- there are various shades of grey. Marketplace wants to know why -- to get answers for the millions of Canadians who visit their dentist every year.