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Teeth are hard structures found exclusively in all vertebrates. Granted, some invertebrates have analogous “teeth”, but they are quite different in their structure and functions. There are different types of teeth found in humans.
Most of us know teeth based on names, such as molar, incisor, or wisdom tooth. At the dental clinic, human teeth are identified by their numbers. As shown in Fig. 1 above, the ADA teeth numbering system treats the 32 permanent teeth in a clockwise fashion as seen by your dentist. Teeth numbers 1 – 16 are on the upper jaw.