Aim: The aim of the study is to compare and assess the knowledge, attitudes and practices of government and private primary school teachers towards oral hygiene and preventive dental health care, in Mogappair, Chennai. Materials and Methods: Government primary school teachers (n=21) and private primary school teachers (n=31) were recruited in this study. The subjects completed a questionnaire that aimed to evaluate teacher’s knowledge, attitudes and practices on oral hygiene and preventive dental health care. Results: The overall awareness among teachers regarding oral hygiene and preventive oral healthcare was less, and has to be increased. Private primary school teachers were better informed and correctly answered most of the questions in the questionnaire, when compared to government primary school teachers, thus proving that they have comparatively more awareness regarding oral hygiene and preventive oral healthcare than government school teachers in Mogappair, Chennai.