Creating a replacement tooth or set of teeth by using the patients mouth as an intra-oral articulator. Also, a medical appliance can be created by using the patients mouth as an intra-oral articulator. A mechanism is fitted within the patients mouth which can hold one or more replaceable teeth. The dentist adjusts the size, color, location and placement of the teeth within the patients mouth until a best fit is achieved. Then, the device, with the artificial and temporary teeth secured thereto, is further processed into a final replacement tooth (teeth). Also, the present system can be used for any dental or medical appliance in or about the mouth, i.e., using the mouth of the patient as the intra-oral articulator will result in superior results.