The course introduces students to microorganisms that have a pathogenic role in different oral diseases including cariogenic bacteria and periodontopathic bacteria and discusses the different mechanisms the body uses to overcome their attacks and the mechanisms of the immune system.The course helps students identify the most common oral pathogens and the immune mechanisms the body uses to defend itself against them. This course handles details of the immune mechanism and the different immunoglobulins and their role in diseases. It also discusses the role of these pathogens in spreading infection and how this can be used to structure infection control programs in the dental setting.