Final answer:
The last teeth to erupt are the third molars, also known as wisdom teeth, usually emerging in the late teens or early 20s. These are the last of the permanent teeth to appear and may require removal if impacted.
Step-by-step explanation:
The last teeth to erupt are the third molars, often called wisdom teeth, in the late teens or early 20s. During one's lifetime, they experience two sets of teeth or dentitions: deciduous teeth (baby teeth) and permanent teeth. The deciduous teeth emerge first in infancy, typically starting around 6 months of age, and are later replaced by permanent teeth. The permanent teeth include 8 incisors, 4 canines, 8 premolars, and 12 molars, with the third molars being the last to appear. Most of the permanent teeth develop and replace deciduous teeth during middle childhood, except for the wisdom teeth which generally emerge in late adolescence or early adulthood. It's not rare for wisdom teeth to remain impacted and require orthodontic surgery for removal.