Periodontally involved model graphically demonstrates severely inflamed gingiva with calculus. Composed of high quality PVC resin and frame teeth for durability so they won't tend to be brittle. Very explicit dental model for dental laboratory using for teacher to illustrate and student to learn. This pathological teeth model is composed of maxillary teeth and mandibular teeth, which is transparent, easy to know the type and structure of adult teeth. Excellent for patient demonstrations in dental offices, and also for legal presentations, light weight and easy to carry.