This paper sets out the benefits and costs of continuing professional development (CPD) for general dental practice. These considerations are important in evaluating CPD yet they are rarely formally assessed. This paper draws on literature specifically on dentistry but also from across the medical profession and the economics of education and training. First, the costs of CPD are itemised with some suggestions as to how costs may be reduced. Second, the benefits are identified and the (limited) evidence on the value of CPD is surveyed. Finally, reasons why some GDPs might not undertake sufficient or appropriate CPD are explored and the need for guidance for dental practitioners is identified.