Abstract: A dental work site illumination system provides illumination directly onto a work site under professional dental care. The illumination emanates from a light source within the swivel coupling, the light source being energized by an electrical generator mounted within the coupling. The generator is driven by a turbine wheel that is caused to rotate by a flow of exhaust fluid, i.e. compressed fluid after having driven a dental tool. The light source transmits illumination to a fiber optic bundle that terminates adjacent to the dental work site.