Cancer of the buccal mucosa ranks fourth in the structure of cancers. Pretumor processes of the buccal mucosa are Bouin's disease, leukoplakia verrucosa, papillomatosis, erosive ulcerative and hyperkeratotic lupus erythematosus and lichen planus, and postradiation stomatitis. Two clinical cases of cancer of the tongue in young men aged 27 years are described. Preventive measures are treatment of pretumor processes in the buccal mucosa, absolute refusal from caustics and from dentures made of different materials, regular check-ups of patients, consultations at specialized oncological institutions with cytological and morphological studies, thorough sanitation of the oral cavity including therapy, surgery, and orthodontic treatment.
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