Actually the Vizilite is not a very good tool, OCF is not a backer of the device (it -Zila-actually went bankrupt a year ago, and the remnants of the company are trying to be reconstructed by a new company Tolmar) and works on more marketing rhetoric than science. The blue light that works well is made by VELscope and also the Sapphire unit by DenMat. There is a third vendor out there, but it is grossly underpowered and not very bright. These two are based on tissue auto-flouresence, a science that the NIH has thrown about 61 million dollars at in the last 10 years. These are all adjunctive devices and only add a small amount more to a screening than a conventional visual and tactile screening. As to Vizilight specifically, it is nothing more than Heinz 2% white vinegar (acidic acid) with a little raspberry flavoring, and a toy light from Omniglo, the same company that makes chemiluminesent lights for kids rave parties, camping use and our military. There is nothing special about their light. That a white light would not do.

By the by, all these things put out a blue light, but the VELscope light for instance it is very specific wave length that will excite the florophors in your cells and cause them to fluoresce in normal cells. In damaged cells - cancer, even pizza burns and cheek bits, the cells lose their ability to fluoresce and that is an indication the doc needs to look closer. These devices are all DISCOVERY DEVICES not DIAGNOSTIC DEVICES, and their 510k FDA approval states this very clearly.

Christine put up a good link for doctors, here is a more basic idea that a lay person could use to determine if they had a good screening or not. http://oralcancerfoundation.org/dental/how_do_you_know.html