The tooth fairy has a good thing going: For mere pocket change, the
sprite acquires a rich cache of stem cells with each "baby tooth" collected.
Typically shed around age six, baby teeth contain one to two dozen stem
cells, say researchers from the National Institute of Dental and Craniofacial
Research in Bethesda, Md, whose findings were published on April 25 in the
online edition of the Proceedings of the National Academy
of Sciences (http://www.pnas.org/). What's more, these cells
appear to be more versatile and longer-lived than so-called adult stem cells.
Vastag B. Twins Sought for Study of Autoimmune Diseases. JAMA. 2003;289(19):2491. doi:10.1001/jama.289.19.2491-a