AimTo assess the oral impacts on daily performances (OIDP), and their relationship to dental caries and gingival diseases in an Egyptian sample of Mansoura school children aged 8- 13 years divide into tow age groups. Methods: A sample of 1200 children were selected on a cross sectional study. The sample was chosen through stratified random sampling within clusters . Children were individually interviewed using the Child-OIDP including the eight-item OIDP frequency scores , and then clinically examined to assess their normative treatment needs for dental caries, and periodontal disease . Results: A total of 1184 (8-13years) were participated in this study. About 63.5% of children had oral impacts during the past 3 months. Child-OIDP scores (mean = 7.8± 4.9). Eating was the most reported performance, followed by cleaning teeth and maintaining emotional state in both age groups . Swelling and abscess was the most important perceived causes . Gingival diseases were of less concern in both age groups. Conclusions: problematic eating and toothache were the most common impacts in Egyptian children. These results reflect needs for oral health promotion and treatment of dental caries.