Shark’s teeth are arranged in rows and the number of rows varies by species. Every time a shark loses a tooth, a new tooth moves in to replace it from the row behind.  Some sharks lose over 30,000 teeth in their lifetime!  Lost teeth fossilize, which has allowed scientists to date shark evolution to over 450 million years (predating insects and dinosaurs!).  Teeth that have recently come from a shark’s mouth will be a pristine white color, while fossilized teeth take on a broader range of colors depending on the type of sediment they fall into.  Many scientists believe a shark tooth must be covered in sediment for at least 10,000 years before it is completely fossilized.  Sharks are harvested for their meat, fins, skin and teeth.  If you are purchasing shark teeth or wear shark tooth jewelry, choose sustainable.  Be sure that the tooth fell out naturally, tell others to shop wisely and discourage the intentional killing of sharks.  #oceanwise #sharkwise #sharksmart #oceansmart #shopsustainable #notyourfinnotyoursoup #sharktooth #sharkteeth #sharktoothjewelry #sharktoothnecklace #fossilizedteeth #fossils #sustainable #conserve #preserve #savesharks #savetheocean • Galápagos tooth 🦷 Photo by @mermaid_kayleigh #galapagosshark #sharkteethhunting (at North Shore, Oahu, Hawaii) https://www.instagram.com/p/BxGTq8vBpDN/?utm_source=ig_tumblr_share&igshid=14hd091dhfc6g