How does a great white shark grow back all of its teeth back?
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Sharks loose and grow teeth throughout their entire lives. Their teeth are specialized versions of the little “teeth” in their skin, the dermal denticles. Quite recently engineers realized that by reducing the amount of turbulence these denticles greatly reduce the drag on a shark as it glides through the water. This discovery is now used to create rough surfaces on e.g. airplane wings! If you look into a shark’s mouth, you can see row after row of teeth. Note that the flatter side of a tooth is the part that faces outwards (towards the lips, the labial side) once it has marched forward to the front row. The rounder side faces inwards (towards the tongue, the lingual side). Once it reaches the front row, a given tooth may only last 10 days. Given that there can be 50 teeth in the front rows of the upper and lower jaws, and they only last 10 days, a single shark sheds around 1800 teeth per year, and tens of thousands in a life time. Which explains why fossil shark teeth are so common. I
