Sharkboy (The Adventures of Sharkboy and Lavagirl)
Shalraths/Vores (Quake Series)
Shamblers (Quake Series)
Kat (Kid vs Kat)
Snare (Kameo: Elements of Power)
Xenomorphs (Alien Franchise)
Shippo (Inuyasha); via technique called the Heart Scar
Soul Evans (Soul Eater)
Guiron (Gamera vs Guiron)
Enobaria (The Hunger Games)
Chompies (The Skylanders)
The Ravenous Octomaw (Splatoon)
Various Monsters (Monster Inc Franchise)
Mileena (Mortal Kombat)
Various Kaiju (Ultraman series)
Thriller (Michael Jackson's Thriller)
DIO (JoJo's Bizarre Adventure)
Ferasan (Star Trek Online)
Morjak (Marvel Comics) has another mouth/face on his stomach with rows of razor sharp teeth.
A Crite (Critters)
Guiron (Gamera vs Guiron) possesses "60 times more teeth than a piranha"
Arlong's (One Piece) teeth are sharp enough to cut through stone, metal, and flesh alike.
Hody Jones’ (One Piece) teeth are even more vicious in appearance and lethality than Arlong's, due to overdose on Energy Steroids.
Charlotte Katakuri (One Piece) reveals that underneath his scarf, his mouth is composed of massive fangs.
In her snow form, Monet (One Piece) can change her teeth into fangs made of hardened snow.
Dellinger (One Piece) has fishman fangs.
The Ravenous Octomaw (Splatoon) has a mouth full of razor-sharp teeth.
As a Cambion, Raven (DC Comics/Teen Titans Go!) possesses retractable sharp teeth.
The Leviathans (Supernatural) can manifest sharp teeth, as their main weapon and method of eating
Count Vladislaus Dracula (Van Helsing) prepares to dig his teeth into an unfortunate victim.
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.
A Spawn (The Deadly Spawn)
Enobaria (The Hunger Games) apparently had her teeth sharpened so she could rip tributes’ throats out.
Chompies (The Skylanders series)
Kevin 11 (Ben 10) possesses Ripjaws' sharp teeth.
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.
A Xenomorph (Aliens)
Moka Akashiya (Rosario + Vampire) bares her fangs.