the question of negative cases in the oral cavity of workers in the chemical industry remains relevant. it has been proven that the high prevalence of non-carious lesions of the mucous membrane of the teeth, oral cavity is associated with production processes such as oil and gas extraction, metallurgy, chemical production, baking bread and confectionery production. prevention and health of dental diseases helps to maintain the working capacity of an important part of the country's population - workers of industrial enterprises, especially since a number of studies reliably reveal the role of dental and environmental tissues in the general condition of the body [1].