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Any tooth of the first set of teeth of young people (or animals).

Cross-section of upper and lower jaws with permanent teeth located above and below the deciduous teeth prior to their exfoliation. The deciduous mandibular central incisors have already been exfoliated.

Any tooth of the first set of teeth of young people (or animals).

Bottom teeth of a seven-year-old, showing primary teeth (left), a lost primary tooth and visible socket (middle), and a fully erupted permanent tooth (right)