The teeth of an adult can be classified into four types according to their functions, position in the oral cavity, the number of the roots they have, and the shape of their crowns. There are four main types: 

• Incisors (medial, lateral)
• Canines
• Premolars
• Molars

As mentioned before, adults have 32 teeth. The upper teeth are known as the maxillary teeth, and they are 16 in total. The rest 16 are the mandibular teeth located in the lower jaw. The upper and lower teeth of the same type are similar, but they are still not identical. 

Each jaw in the midline can be theoretically divided into two quadrants. That is why the oral cavity has four quadrants. According to this, every quadrant has eight teeth, including:

• One medial (or central) incisor
• One lateral incisor
• One canine tooth
• Two premolar teeth
• Three molar teeth

NOTE: The 3D model lacks third molars.