Patients who use tobacco and alcohol heavily are prone to oral cancer. Cancer screening is done in order to detect the signs of cancerous cells at early stage and take necessary steps to cure the same. This can be done during routine dental visit. Dentists make a note of the medical history of patients and check out for abnormal cells using special equipment. The process may involve removal of some of the cells from the mouth and performing biopsy to find out if they are cancerous. The tests performed can help in taking early steps to cure oral cancer.