Aim of research: to analyze the dental status of children with the teeth formation disorders on the background of the digestive diseases (DD). Object of research – the change of the teeth hard tissues and periodontal tissues, subject of research – clinical characteristics of the status of teeth hard tissues and periodontal ones. Results of research: in children with chronological enamel hypoplasia (CEH) and molar-incisor hypomineralization (MIH) on the background of digestive diseases (Class ICD-10, К00-К93: “Gastritis and duodenitis” (К29), “Cholecystitis” (К81), “Other bile-excreting diseases” (К83)) was fixed the high and very high intensity of the dental caries, respectively. Caries as CEH and MIH complication was diagnosed in 55,81 % and 42,85 % of examined, respectively. In children with CEH and MIH on the background of digestive organ diseases was diagnosed the middle severity of gingivitis РМА, Papillary, Marginal, Alveolar Indices): 29,13±8,87 % and 25,24±8,97 %, respectively. The rate of persons with the healthy periodontal tissues according to CPI (Community Periodontal Index) was 21,42±21,91 % in children with CEH and 7,14±13,11 % in examined with MIH. In examined with CEH and MIH was fixed the satisfactory hygiene of the oral cavity according to Green-Vermillion index (OHI – Oral Hygiene Index). Conclusion: children with teeth hard tissues formation disorders on the background of digestive diseases need the dispensary observation and course of the therapeutic and prophylactic arrangements for preventing the possible complications (caries, gingivitis, periodontitis).