Abstract: A removable intraoral lighting device which can be assembled to many various kinds of dental tools, including a main assembly, containing a miniature and powerful light source, fed from an electric power supply. The main assembly has an external geometrical structure which enables connection to a dental tool, such as a saliva suction device. The removable intraoral lighting device can also include one or more clips for clipping an electrical wire, if necessary, to the dental tool. The scope of the invention includes a method of connecting the removable intraoral lighting device to the dental tool, freeing the dentist's and the dental assistant's hands, and using it as an internal source of lighting a patient's oral cavity during dental treatment.