how many layers of teeth do sharks have
Unlike most other animals and fish, the inside of a shark's mouth has several rows of teeth lining the jaw. Depending on the species, they may have anywhere between 5 and 15 rows consisting of hundreds of teeth. Now, it's important to note that when a shark loses a tooth, the one behind it comes it to take its place. This process doesn't happen instantly, but it usually replaces it within 24-48 hours.