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Objective. evaluation of oral hygiene to enhance the prophylaxis of complications specifically of dental caries in children with disturbances in tooth formation (DTF) who live on radiologically contaminated territories after the Chornobyl NPP (ChNPP) accident. Materials and methods. Children aged 6–14 years (n = 1470) with DTF were the study subjects examined in 2012– 2016. Among them there were (n = 528) residents of the zones III and IV of radiological contamination after the ChNPP accident with 137Cs soil contamination density 1-15 Ci/km2. The effective radiation dose in them was not exceeding 1 mSv/year. The Green-Vermillion and Silness-Loe oral hygiene indices were assesses within clinical examination methods. Results. The worth oral hygiene was revealed in children having got the DTF, compensated chronic diseases of organs and systems, and in those with burdened radiation history. The Green-Vermilion and Silness-Loe indices were 1.7 ± 0.51 and 1.65 ± 0.46 respectively. Conclusions. A significant deterioration in oral hygiene confirmed by the highest values of the Green-Vermillion index (1.7 ± 0.51; p &lt; 0.001 – «unsatisfactory oral hygiene» criterion) and Silness-Loe index (1.65 ± 0.46; p &lt; 0.001 – «poor oral hygiene» criterion) was found in children with DTF aged 6-14 years being residents of contaminated areas as a result of the Chernobyl accident. The revealed deterioration may be due to a set of negative factors, including the impact of ionizing radiation in low doses and peculiarities of social status. Results of the questioning of surveyed pediatric contingents both having got an DTF and with no defects of the hard tissues of teeth indicate an insufficient level of knowledge and skills in hygienic care of oral cavity regardless of the area of residence. Development of a set of measures to prevent the DTF complications in children should be carried out taking into account the state of oral hygiene, level of knowledge and skills in oral care, and include the use of hygiene products, namely toothpastes and anti-caries mouthwashes. Key words: children, disturbances in tooth formation, systemic hypoplasia of enamel, molar-incisor enamel hypomineralization, hygienic indices, ionizing radiation, ChNPP accident.

ORAL HYGIENE IN CHILDREN WITH DISTURBANCES IN TOOTH FORMATION WHO WERE AFFECTED AS A CONSEQUENCE OF THE ChNPP ACCIDENT