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Theropod teeth are complex, and vary in size, shape, and in the anatomy of their serrated edges.

Coprolites attributed to the archosaur Smok—a fearsome 5-meter-long bipedal predator with serrated teeth and powerful jaws—contained the crushed bones and teeth of its prey.

"It was a zombie knife, a serrated zombie knife," Mr Olumide said of the attack on his son outside Clapham South underground station in South London.

They come by the hundreds, all vying for the latest Labubu, a furry toy character with rabbit-like ears and a nightmarish grin stretched wide over a row of serrated teeth.

They say to picture the faults that brush up against each other as having serrated teeth like the edge of a saw.