Preventative Dentistry in Stuart, FL Oral Cancer Screening Oral cancer screening is a thorough check-up of your mouth performed by a dentist to look for cancerous and precancerous signs in your mouth. The main aim behind this screening is to detect the disease at an early stage so that proper measures can be taken to cure or prevent it . The test might not reveal the results instantly, and therefore, the doctor might recommend the patient return in two weeks.