Abstract : ''Gingival disease'' and ''dental caries'' consider as distinct diseases around them professional and research displines develop, yet each disease is related with the same oral microbiome compromising mostly commensal microorganisms, similar preventive approach is effective with both diseases. The goal of present research was to find the association between ''gum disease'' and ''dental caries'' in children aged 9 and 12 years. The sample examined in this study consisted of 200 children attended pediatric and preventive teaching clinic at Wasit university. All children subjected to clinical examination to assess the DMFT index according to ''WHO 1997''. Also information obtained about gingival and oral hygiene status by assessment of gingival and plaque index scores according to Silliness and Leo 1963. Only six selected teeth are scored according to'' Ramfjord ''. Data collection started from 2/ January to 20 May 2019. Data analyzed using a statistical package for Spss ''version 24'' for Windows and Excel 2007. The mean value of gingival and plaque indices scores was higher in children aged 9 years than 12 years. Also The mean value of gingival index scores in control, case 1 and case 2 groups was (0.29 ± 0.007), (0.52 ± 0.025) and (0.86 ± 0.024) respectively. Analysis of variance showed highly significant difference between the mean value of plaque index scores in control and in case groups (1, 2). There was strong relation between the severity of gingival disease and the amount of plaque accumulation with dental caries, young children in mix dentition time need proper supervised tooth brushing