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survival of melanoma patients.Objectives To investigate the prevalence and factors promoting caries in primary dentition of 3-5-year-old children in Northeast China. Materials and methods Data of 1,229 children aged 3 to 5 years were randomly selected. The caries prevalence and other indicators were assessed, and the results analyzed by SPSS. A questionnaire was also given to the children's guardians to ascertain the potential risk factors associated with caries. Results The decayed, missing, and filled teeth (dmft) index in children aged 3, 4, and