This Bite Block was designed and developed by our Industrial Design team. Its the perfect device to keep your dogs mouth open while you are brushing their teeth and insuring your fingers safe. Its practical, small and easy to use. Insert in your dogs mouth with your thumb through the hole. With the same hand put fingers under lower jaw to steady mouth. Brush with a manual toothbrush on the other side of dogs teeth. Move the Bite Block to the other side and finish brushing teeth. Made of a firm rubber construction. Spark also worked on creating the patent drawings and patenting this idea.