Stomatological examinations were conducted among 270 workers employed at pigment and paint industry, exposed to organic solvents and other gaseous substances developed during the thermal conversion of oils. In the control group of one hundred persons employed in whom the detrimental action of chemical compounds does not exist, stomatological examination did not show any special variations from the normal average. Comparing the two groups it was evident that the hygiene of the oral cavity was significantly worse in the group of workers exposed to organic solvents and other chemical compounds than in the control one. Statistical analysis of the obtained results pointed out that the average index of intensity of changes in paradontium and the susceptibility to changes evaluated according to DMF index also shows higher values in the examined group as compared with the control. The frequency of occurrence of various pathological changes including leukoplakia of the mucosa was presented in detail. All collected data were divided into five groups of different exposure to the chemicals.