? The upper and lower jaws are connected by hinges and can be opened up to 180 degrees. Clearly check the entire anatomical tooth. All teeth are molded together and can not be removed. ? The tooth model is the same size as the mouth and contact with the gum. The size and appearance of teeth are the same as the true teeth, with a total of 28 teeth. (The teeth are not removable) ? You can also practice teeth cleaning, studying the surface and mold footprints. There are spaces between teeth, which is a good tool to teach people to brush your teeth and pass the dental silk. ? It is made of hard resin, similar to plastic, no soft glue. Durable and waterproof. This is a good example of dental brushing and silk teaching. ? Ideal model for dental floss and brushing teeth for adults or children.