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The teeth are multifunctional appendages that essential in basic human functions, like eating and speech. Teeth are composed of multiple unique tissues with varying density and hardness that allows them to tolerate the significant forces and wear of mastication. They are attached to the maxilla (upper jaw) and the mandible (lower jaw) of the mouth. Humans have four different types of teeth that each have a specific function, which is classified by structure and location. Also, humans have two generations of teeth throughout a lifetime: 20 primary teeth and 32 permanent teeth.[1][2]