Today’s children are tomorrow’s leaders. The children form 38-40% of general population. One of the major health problems faces by the children is oral health problems, more commonly dental caries. A descriptive study to assess the knowledge regarding oral hygiene and prevention of common oral health problems among primary school children. The main objectives of the study were to assess the knowledge regarding oral hygiene and prevention of common oral health problems among primary school children and to find out the association between knowledge score and selected demographic variables