Background: Dental diseases and their sequelae promote comorbidity and polymorbidity. The objective of the study was to analyze the overall incidence including diseases of the oral cavity among contract military personnel. Materials: We conducted a retrospective analysis of the overall 5-year morbidity by ICD-10 categories among contract soldiers serving in Dagestan for 2012–2016. We estimated the incidence rate per 1,000 people by disease categories and subcategories (C00–C14, K01–K04 and K05–K14), the structure of morbidity, worktime losses due to sickness absence, and rates of diseases of the digestive system by subcategories K01-K04 and K05-K14. Results: With account for the diseases of the oral cavity, the proportion of leading diseases (diseases of the digestive system, respiratory system, musculoskeletal system and connective tissue) among the contact soldiers was 41.1 % and differed from the morbidity structure in the general population. The incidence rate of diseases of the digestive system was 1.6 times higher than that of diseases of the respiratory system, which was equal to that in the K01–K04 subcategory. In the category of diseases of the digestive system, the proportion of caries, its complications and other diseases of hard tissues of teeth reached 62.8 % and that of other diseases of the oral cavity – 17.4 %. As for worktime losses, the share of this category reached 8.1 %, of subcategories K01–K04 and K05–K14 – 0.7 % and 2.5 %, respectively. Having excluded the latter subcategories from the analysis, we found that the proportion of diseases of the digestive system became 4.3 times lower and they dropped to the sixth place. Conclusion: The proportion of diseases of the digestive system, when including and excluding diseases of the oral cavity in the structure of general morbidity, was 18.7 % and 4.7 %, respectively, while diseases of the respiratory system, musculoskeletal system and circulatory system prevailed. It can be assumed that the problem of dental caries is interdisciplinary and its prevention is a common task of both dentists and hygienists.