Background: Oral cancer is considered a public health problem worldwide. Dental colleges may play an important role in educating patients about oral cancer. This study was done to evaluate the knowledge regarding Oral Cancer among teenagers & young adult patients attending Dental Clinic. Methods: A descriptive cross sectional survey was conducted between 15th Aug 2019 to September 15th 2019 in the Department of Oral Medicine and Radiology, Government dental college, Shimla amongst the teenagers & young adult patients using self designed, close ended 20 questionnaires. Results: Out of total 318 patients in age group of 15-25 years present to the OPD, 250 people agreed to participate in the study.Among these, 226 (90.40%) had heard about oral Cancer and their major 158(63.20%) source of information was Mass Media. 175(70%) patients thought that oral cancer is preventable, 188(75.20%) thought that it is curable and 66(26.405) thought that it is contagious. Among the total, 119( 47.6%) had knowledge that Tobacco smoking was the risk factor for oral cancer ,215(86%) told Tobacoo chewing, 214(85.7%) told Heavy alcohol drinking,161(64.4%) told Sun radiation, 132(52.8%) told Non consumption of fruits & vegetables and 172(68.8%) told that Advancing age was the risk factor for oral cancer. Among the total , 198(79.2%) participants told that oral cancer was present as Non healing ulcer, 142(56.8%) told that it present as red patch, 145(58%) told that it present as white patch, 174(69.6%) told that it present as Lump in mouth/neck while 179(71.6%) told that it present as Growth of abnormal tissue. Among the total, 218(87.2%) told that oral cancer can recurrence was possible after cancer treatment, 211(84.4%) had Knowledge about post cancer treatment survival. 155(62%) told that oral cancer can be treated with surgery, 169(67.6%) told that it can be treated with medications, 131(52.4%) told that it can be treated with Chemotherapy and 95(38%) told that it can be treated with