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] other risk factors include hpv infection, [ ] chewing paan , [ ] and sun exposure on the lower lip. [ ] oral cancer is a subgroup of head and neck cancers . [ ] diagnosis is made by biopsy of the concerning area, followed by investigation with ct scan , mri , pet scan , and examination to determine
, frequency and method of application of the carcinogen (the substance that is causing the cancer). [ ] aside from cigarette smoking, other carcinogens for oral cancer include alcohol, viruses (particularly hpv and ), radiation, and uv light. [ ] tobacco[ edit ] tobacco is the greatest single cause of...
https://en.wikipedia.org/wiki/Oral_cancer