OBJECTIVE The aim: Estimation of caries prevalence and intensity, determination for treatment necessity of deciduous teeth in 3-6 years old aged children from Poltava region for further effective development of programs for caries and its complications prevention. METHODS Materials and methods: Totally 335 children from 3 to 6 years old of preschool institutions of Poltava and Poltava region aged were examined with the signed accordance of their parents. All children were examined for the prevalence (%) and intensity of caries of deciduous teeth by the Decay Extracted Filling index (DEF index). Quantitative parameters were processed by standard statistic methods. The calculation of the highest caries intensity (Significant Index of Caries) was performed according to the D. Bratthol`s method. The level of dental aid (LDA) was assessed by the DEF index according to P.A. Leus recommendations. Treatment necessity of children was also determined. RESULTS Results: The research in caries prevalence of deciduous teeth of revealed that the number of children with caries increases with their age. The most significant parameter growth is observed at the age of 4 to 5 years. Carious lesions intensity increases at the age from 4 to 5 and from 5 to 6 years most significantly. CONCLUSIONS Conclusions: The most common indicator in all studied groups was a D-parameter, which indicates low parents awareness about deciduous teeth treatment necessity. That case confirms low level of dental aid (14%) and significant treatment need which is 50.7 %. Affection of molars always exceeds the affection of other groups of teeth. We did not find a significant difference in caries distribution among children of different genders. The obtained results encourage realization of sanitary and educational propagation on the awareness of parents on dental healthcare of their children.