Chewing tobacco, also known as “snuff,” is ground tobacco that is placed between the gum and cheek. Smokeless tobacco contains more nicotine than cigarettes and contains 28 cancer causing agents. During an oral cancer screening, the doctor or hygienist will check your lymph nodes, and all of the structures in your mouth. They are looking for any lumps or bumps that shouldn’t be there. Smoking and alcohol use increase your risk for oral cancer. Remember, if you notice a lump, bump, or a sore in your mouth that has been there for more than two weeks, see your dentist right away.