DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
New tooth erupting. Close-up of the mouth of an 8- year-old boy, showing eruption of a permanent incisor in the upper jaw. Permanent teeth start to erupt at around age six. They replace the milk teeth (deciduous or primary teeth), which loosen and fall out due to reabsorption of the roots. The full set of permanent teeth is complete by around age 12. This is with the exception of the wisdom teeth, which usually erupt between 17 and 21.
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