Large dental arch model for toothbrushing instruction (unused) This model is mainly used in dental clinics for patient education and in schools and kindergartens for oral hygiene education. * It is approximately 2 to 6 times the size of a real set of teeth, allowing for a clear visual explanation of tooth structure and brushing techniques. * The jaw can open and close, allowing for the demonstration of the back teeth and the backs of the teeth. * It is connected by metal hinges (as shown in the image), allowing for the simulation of mouth movements.