New England Aquarium - Sharks
Last weekend I finally got to visit the Aquarium. The sharks were looking pretty threatening and this is what you would see if you had to jump in the big tank for the cleaning operations. Shark teeth are embedded in the gums rather than directly affixed to the jaw, and are constantly replaced throughout life. Multiple rows of replacement teeth grow in a groove on the inside of the jaw and steadily move forward as in a “conveyor belt”; some sharks lose 30,000 or more teeth in their lifetime. The rate of tooth replacement varies from once every 8–10 days to several months.Wikipedia
