A fingerprint in your mouth? Germs in your gums are just as good at...

Breakthrough: Dentists previously thought one type of dental treatment worked for everyone.

http://www.dailymail.co.uk/sciencetech/article-2477436/A-fingerprint-mouth-Germs-gums-just-good-identifying-ethnicity-research-reveals.html?ITO=1490&ns_mchannel=rss&ns_campaign=1490