Source: Boston.com Author: Neil Munshi The usual dental checkup goes something like this: lean back, open wide, avoid flinching, rinse, spit. But in addition to looking for cavities, dentists are increasingly checking for oral cancer, too - and not just by peering and probing. A relatively new screening tool allows dentists to better gauge whether a patient is in the early stages of oral cancer by looking at the mouth under a special light. But the test may be overused, and it's not yet clear whether it justifies its price tag. A review of studies of the devices published in this month's Journal of the American Dental Association concluded that for low-risk patients, there is "insufficient evidence to support or refute the use of visually based examination" devices, such as the ViziLite. Still, roughly 10 to 15 percent of the 100,000 practicing dentists in the United States offer ViziLite or a similar scan, which some credit with helping them better identify lesions in the mouth than simply looking with the naked eye. "Frankly, I've seen stuff I would normally just have glossed over and it doesn't hurt to take a second look . . . at something that might not normally be looked at - that might save somebody's life," said Dr. Anjum A. Ansari, a downtown Boston dentist, who charges her patients $80 for the service. Insurance has only covered the scan for one of her patients, Ansari said. That $80 is the test's only actual advantage, said Dr. [...]