This study is a randomized trial. It will especially assess the level of physicians’ knowledge, attitude and practice toward the prevention of oral diseases in children in Tehran and it will also assess the effectiveness of smart phone application in promoting children’s oral health compared with conventional methods of physicians’ continuing education in Tehran. Study population is a sample of general practitioners working in primary health centers in Tehran which are selected by census sampling method. First, baseline data of the physicians will be collected by the questionnaire. The sample will be randomly divided into two groups. While the first group (n=135) receives training through a smart phone application, physicians of the second group(n=100) will receive traditional CE. Interventions will be completed within 10 days after baseline data collection. First follow up would be performed 10 days after baseline data collection, and the second follow up would be done four months after baseline data collection. Follow up data collections would be done with the same questionnaire as baseline tool. Some questions on feedback of the training method will also be added to the follow up questionnaire. Each participant would enter a personal code in the both baseline and follow ups questionnaires in order to provide the possibility of measuring individual changes.