Sharks don’t keep one set of teeth. New teeth grow in rows behind the front row and roll forward when a tooth chips or wears out. Many species replace at least one tooth each week—adding up to thousands over a lifetime. That’s a big reason beaches like Venice, Florida keep turning up teeth.
From Arthur’s logbook
I’m Arthur. Sharks don’t keep one set of teeth. We grow new teeth in rows behind the front line, and when a tooth chips or gets dull, the next one rolls forward—no dentist needed. Many sharks replace at least one tooth each week, so over a lifetime that adds up to thousands. Tooth shapes fit the job: smooth, dagger-like teeth for grabbing fast prey; broad, serrated triangles for slicing; and long crowns with tiny side points for tricky bites. If you found one on the beach, it’s a retired blade from a very busy mouth.
How the conveyor belt works
Rows of replacements
Most sharks grow teeth in multiple rows. When the working tooth is lost or damaged, the next tooth rotates or slides into place. It’s automatic and fast.
Shape fits the job
Different diets, different tools. Mako-style teeth are smooth and narrow for gripping fast prey. Great white-style teeth are triangular with fine serrations for slicing. Sand tiger teeth are long with small side points (“cusplets”). These clues also help you identify beach finds.
Pro tip: Identify in this order: 1) Shape → 2) Serrations → 3) Root. Then consider where you found it.
Why Venice, FL has so many teeth
Ancient fossil layers offshore plus steady coastal erosion keep uncovering teeth and moving them toward shore. That’s why Venice—and parts of the Carolinas—are famous for regular beach finds.
Quick FAQ
Do sharks have “baby” and “adult” teeth?
No. Sharks continuously replace teeth in multiple rows that move forward as needed.
How many teeth can a shark shed?
It varies by species and age, but many sharks shed thousands over a lifetime.
What clues help identify a beach-found tooth?
Start with shape, then look for serrations, then check the root. Location adds helpful context.
Until next tide,
Arthur the Shark
Adventure, Elegance, and the Ocean in Every Creation