http://www.chinadaily.com.cn/english/doc/2006-03/01/content_524944.htm
"It is the ID card you will never lose or forget to carry with you unless your teeth fall out. Scientists have implanted an ID chip into a tooth to show how detailed personal information can be stored. The scientists say the tooth chip will be useful to forensic scientists trying to identify bodies after natural disasters and terrorist attacks with numerous victims. They say it will also have advantages over a simple identity card."
