Your dentist or hygienist will look for signs of oral cancer as part of your regular exam. He or she will feel the area under your jaw, the sides of your neck, and the insides of your lips and cheeks, as well as examine the sides of your tongue and the roof and floor of your mouth, looking for lesions or areas of concern. The purpose of an oral cancer screening is to detect any localized lesions as early as possible. The earlier a problem is caught, the easier it is to treat. An oral cancer screening is performed at every visit by either a hygienist or dentist. It is non-invasive and comes at no additional cost.