SHARKS HAVE THE ABILITY TO CONTINUOUSLY REGROW THEIR TEETH, THEY LOSE AT LEAST 30,000 TEETH OVER A LIFETIME. EVERY TIME A SHARK LOSES A TOOTH, THE TOOTH IN THE ROW BEHIND IT MOVES UP TO TAKE THE LOST TOOTH'S PLACE. YOU CAN SEE, IN THE IMAGE ABOVE, SUCH A TOOTH LOSS TAKING PLACE.