A category of dentists, defined by the Department of Health in the UK, working in the primary care setting who provide services which are in addition to their usual and important generalist role. The DwSI provides a service which is complementary to the secondary services but does not replace that provided by a dentist who has undergone the training required for entry to a specialist list. The DwSI is an independent practitioner who works within the limits of their competency in providing a special interest service, and who refers on where necessary. The DwSI may deliver a clinical service beyond that normally provided by a primary dental care practitioner or may deliver a particular type of treatment. Special interests may be demonstrated by dentists through completion of formal training programmes and/or experience-based evidence.