The invention shows a light-curing device having a light source and a light guiding device, in particular a light guide rod (18) with a light inlet surface which, viewed in the direction of emission of the light source, extends adjacent thereto and comprises at least one sensor facing the light source and arranged adjacent to the light inlet surface, and having a control device (32). The light guiding device is arranged in a handpiece (14) of the light-curing device (10), as well as having a base station (12) of the light-curing device (10). The base station (12) is provided with a second light source and a second light sensor for bidirectional optical communication with the handpiece (14) via the light guiding device, which bidirectional communication occurs, in particular, in the frequency range of visible light or of UV light.
