A Literary Fascination with Teeth

"The alligator paused with her blunt nose only inches from the camera's lens.  Even with her mouth shut, the lethal downward teeth were on full display, a crooked picket fence along her upper jaw."
From Chomp by Carl Hiaasen

What's with the fascination with teeth lately?

"the rocky line of his bottom teeth"
from The Book Thief by Marcus Zusak

"he smiled showing a line of teeth that looked as if they'd been borrowed from different people's mouths."
from Disco for the Departed by Colin Cotterill