An oral cancer screening is usually conducted without you even knowing it. When a dentist does a comprehensive oral exam, they check inside your mouth for signs of cavities, gum disease, etc. While looking for these signs, they’re also looking for signs of cancer or precancerous conditions inside the mouth. Signs may present themselves as white spots/patches, irritation, or sores. If they’re unsure of the answer to the screening, or if a suspicious spot is found, they may take a tissue sample that will be sent off to a lab for testing. In order to determine the extent of the cancer or damage, if found, a camera may be used to look down the throat and image testing may be included.