Disclosing light of dental restorative materials for a high speed handpiece setting and disclosing light device of dental restorative materials, comprising a light-emitting (1) based on the emission of ultraviolet light (2) through LED (3), capable of being installed on a high speed handpiece setting (4) associated to white light LED (3B), or a dedicated light-emitting device (5), which, when focusing the light beam on the tooth, evidences, through difference in fluorescence, restorative materials (6) from the original tooth structure (7).