Permanent and Deciduous Teeth: Humans have two sets of teeth during their lifetime: deciduous (baby) teeth, which typically erupt between 6 months and 2 years, and permanent teeth, which replace them and are adapted for lifelong chewing and speech.
Tooth: A tooth consists of enamel, dentin, pulp, and cementum, and is anchored into the jaw by periodontal ligaments; it functions in mechanical digestion and sensory perception.