After the supervision over patients with cancer of mucous membrane of oral cavity (MMOC) admitted for treatment in the Tver Regional Clinical Oncological Hospital (TRCOH), the analysis of 427 primary revealed cases of cancer of mobile part of the tongue MPoT (S 02) was carried out. The study included retrospective analysis of case records of 237 patients treated from 1997 to 2013 with the diagnosis of MPoT and prospective examination of 190 patients treated by authors in specialized departments of TRCOH. On the basis of questioning of 67 III-IV stages tongue carcinoma patients at the age of 50-59 years clinical course features, cancer risk factors and oral care patterns were studied. It was revealed that patients often make decision to see an oncologist to meet relatives wishes, prefer self-treatment, trust hearings and quacks or simply hope for self-recovery. Studying of dental status revealed high prevalence and intensity of caries. All males and the majority of sampled women weren't informed about additional methods of oral cavity hygiene (dental floss, mouthwashes, gels) and had unsatisfactory or bad level of Fedorov-Volodkina hygienic index. We revealed a high necessity in treatment of caries and its complications, an average of 3.61 and 2.73 teeth needed filling and 4,43 and 1.77 teeth - extraction in male and female patients, correspondently. The received data identify a great need for dental treatment and patient education in patients with tongue malignancy.