Toothy Trivia: Part 1
Sharks can regrow unlimited sets of teeth. (http://www.npca.org/protecting-our-parks/wildlife_facts/sharks.html)
Long in the tooth, meaning old, was originally used to describe horses. As horses age, their gums recede, which gave rise to the practice of looking at a horse’s teeth to figure out its age. The older the horse, the more recessed the gums, and the longer the teeth look. (http://www.randomhouse.com/wotd/index.pperl?date=19961217)
Like fingerprints, everyone has a unique tongue print.