The authors give an account of the results of an epidemilogical investigation of the cariosity in adolescents of the East Slovakia region. They assessed the prevalence of caries and the intensity of cariosity by means of the DMF index. They investigated also the cariosity of individual teeth and the cariosity in individual subjects. The incidence of dental caries is 98.7% and the intensity according to the DMF index is on average 8.9.