Guiron (Gamera vs Guiron) possesses "60 times more teeth than a piranha".
Sunny Baudelaire (A Series of Unfortunate Events) was born with sharp teeth and loves to bite things. In fact there's very little that Sunny doesn't enjoy biting.
Enobaria (The Hunger Games) apparently had her teeth sharpened so she could rip tributes’ throats out.
The Leviathans (Supernatural) can manifest sharp teeth, as their main weapon and method of eating.
A Vampire (Supernatural) bares her fangs.
Werewolf (Teen Wolf)
Werecoyote (Teen Wolf)
Kanima (Teen Wolf)
Wendigo (Teen Wolf)
After becoming a Metahuman by getting bitten by kryptonite-infected cave bats, Buffy Sanders (Smallville) had been gifted the power to have sharp fangs in order to not only suck the blood from others, but to also replicate the powers from superpowered enemies, like other Metahumans for example.
Count Vladislaus Dracula (Van Helsing) prepares to dig his teeth into an unfortunate victim.