Basically, it's additional training in general dentistry. After graduation everyone has learned, to varying degrees, the skills needed to practice dentistry however their level of expertise, turnover rate, and skill is obviously below that of someone who has been in the field for a while and has been practicing day in and day out. Unlike a specialty program such as Perio in which a dentist gains extra training to treat the tissues surrounding and supporting the dentition, a GPR provides extra training in the general practice of dentistry. In a GPR graduates continue to work on their skills in a structured and supervised environment and hone their craft. Dental school is different than private practice, of course, and I've been told that this post-graduation investment is often well worth the time to help you ease into that transition. 'But don't dental schools give you all the training you need?' No, they give you training adequate to get licensed but dentistry involves constant learning and maintenance of skill - remember, it's called the practice of dentistry, and practice makes perfect, and that is what a GPR provides.