Over 18 complete shark teeth in each display case, located in Reston, shipping is $4.99 for 1, $6.99 for 2, $8.99 for 3-4, and free shipping for purchasing five or more. Pics are a sample of which you will be receiving. Teeth were collected near Calvert Cliff's VA side. Shark teeth first appeared about 350 million years ago. They belong to a large group of fish with a skeleton made of up cartilage instead of bone. The only fossil remains of ancient sharks are their teeth; The teeth grew constantly to replace older ones that wore out. Some ancient sharks grew as long as 40 feet and had teeth as large as 4 inches!