Why Sharks Are Covered In Teeth

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Sharks wouldn’t be known for their fierce teeth today if it weren’t for their ancient scales.

To learn more about this topic, start your googling with these keywords:
Dermal denticles: also called placoid scales, they’re the most primitive form of fish scales that are structurally similar to teeth and are today found only in sharks, rays, and chimaeras.
Outside-in theory: The strongest theory for the evolution of teeth, which are thought to have evolved from dermal denticle scales.
Ostracoderms: Extinct armored jawless fish that lived in the Paleozoic Era
Thelodonts: Extinct jawless fish that had individual scales as opposed to plates of armor
Placoderms: Now extinct, they were some of the first jawed fish and lived from the Silurian through the Devonian era.

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Fraser, Gareth J., et al. "The odontode explosion: the origin of tooth‐like structures in vertebrates." Bioessays 32.9 (2010): 808-817. authors.library.caltech.edu/20...

Huysseune, Ann, Jean‐Yves Sire, and P. Eckhard Witten. "Evolutionary and developmental origins of the vertebrate dentition." Journal of Anatomy 214.4 (2009): 465-476. ncbi.nlm.nih.gov/pmc/articles/...

Pennisi, Elizabeth. "Eating Was Tough For Early Tetrapods." (2013): 390-391. science.sciencemag.org/content...