Primal Fear for most people. Also, teeth are very much associated with youth, vigor and hygiene, so nasty teeth instantly give an image of sickness, dirtiness and malevolence. Sharp, fanged teeth are an universal identifier of a predator, too, so anyone who sees fangs or a maw full of sharp teeth will instantly feel threatened. Can be an indicator of an evil character, although good ones aren't disqualified. Related to More Teeth than the Osmond Family and Fangs Are Evil.
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Anime and Manga
- Arlong and Hody Jones from One Piece. Justified as they're both shark fishmen (a sawshark and a great white shark respectively).
- Viral from Tengen Toppa Gurren Lagann.
- Grell Sutcliff from Black Butler.
- Gyro Zeppelli in Steel Ball Run is a rare good guy example. His teeth are metallic and have "Go! Go! Zeppelli!" engraved on them. Most of the time his teeth are drawn normally, but when he throws a mischievous smile, the engravings can be seen, which can be a little jarring.
- The titular character of Soul Eater and Giriko both have mouths entirely full of pointed teeth, neither of which is ever commented on.
- Emperor Ganishka from Berserk looks like an Indian Santa Claus with a bear trap for a mouth.
- Rin Matsuoka from Free! has shark teeth for some reason (as a child he only had Cute Little Fangs). It's because his representative animal in the series is a shark, but in universe no explanation is given.
- Moral from Hamatora has shark-like teeth.
- Nanana from Bleach has regular-shaped teeth, but they're colored black and gold (in a checkered pattern).
- Kubera: Despite looking almost entirely human, Yuta actually has rows on rows of teeth in his mouth. We get an even clearer picture when we see Yuta hide Leez in his sura-form mouth to protect her from a hail of energy blasts. After their attacker leaves, Yuta anxiously wants Leez to come out but she's remarkably casual about getting stuffed into a mouth full of sharp, pointed teeth. She even cuts herself while climbing out but manages to keep her reaction to mild surprise/interest, going to show how hard she's trying to show she trusts her friend.
- In Batman: The Dark Knight Returns the leader of the Mutant Gang has filed his teeth to points, and uses them to rip out the throats of the mayor and his aides (off panel).
- For that matter, this trope is also played with regarding The Joker and his teeth - depending on the artist, his teeth can be a nasty yellowed color (implying he probably doesn't brush them), drawn unevenly, drawn longer than or as being more prominent than normal, share space with FAR too many teeth for a normal human being, or a combination of more than one of these.
- Gargamel in The Smurfs mostly appears with only one top tooth in his mouth in most comic book and cartoon show appearances.
- Spider-Man villain Tombstone has pointed teeth, because he purposely filed them that way to make himself look scary.
Films — Animated
- Sharpteeth in The Land Before Time.
- Scar, at least once, in The Lion King. The hyenas too. "Yes our teeth and ambitions are bared!"
- Jafar from Aladdin, in his old man disguise.
- In Beauty and the Beast, one of the servants suggests that the Beast should be nicer to Belle. The Beast tries to smile, but realizes he has More Teeth than the Osmond Family.
Films — Live-Action
- James Bond:
- Jack has one for a moment in Fight Club, when he smiles at a fellow coworker during a meeting and his mouth is a bloody mess.
- Shanghai Knights: During a chase scene, Roy runs into a demure-looking street vendor and starts putting the moves on her... then she smiles, revealing hideous rotting British Teeth. He understandably panics.
- In Coneheads, the titular characters have this until they fix their teeth to blend better amongst humans: not only are their teeth shark-like, when they open their mouth wide, it shows endless rows of them.
- Seth Brundle in David Cronenberg's remake The Fly (1986) slowly loses his teeth as the transformation progresses, making him look more inhuman and threatening.
- The Lord of the Rings:
- When the Mouth of Sauron appears, his helmet covers up every part of his face except for his mouth, which often grins with elongated, pointy teeth covered in black ichor. Eugh.
- Less pronounced, but if his slightly insulting behavior at the beginning of the first movie hasn't suggested to you that Saruman might be a bad guy, his rather filthy teeth (compared to Gandalf's fairly healthy ones) really ought to have.
- Winslow Leach in Phantom of the Paradise had his teeth replaced with sharp stainless steel teeth while he was in prison.
- Pennywise in It can morph his teeth into a fanged maw.
- Arno Blunt, The Dragon from Artemis Fowl and the Eternity Code. After getting his teeth shattered early on in the book, he gets a number of interesting - and somewhat disturbing - prostheses.
- In Discworld, Cohen the Barbarian has dentures made out of diamonds. In the Disc, diamond teeth are associated with trolls, so anyone who sees Cohen's is understandably disturbed.
- Apparently Randall Flagg in The Stand. "There were worse things than death. There were teeth." (illustrated rather well with a big lamprey-mouth sketch in the comic.)
- Every time Vlad in Count and Countess is about to take a bite out of someone, he grins. The glimpse of artificially sharpened teeth serves as the victim's first and last warning.
- Penny Arcade combines it with Gross-Up Close-Up to illustrate Gabe's less-than-stellar mouth hygiene (how he doesn't realize he has a rabid badger living inside his mouth, we may never know).
- № 4 from Hell(p) with his shark-like teeth is a non-villainous example.
- The Inexplicable Adventures of Bob!— "Hey! A bear! He's smiling!"
- The Order of the Stick features goblinoids with tusks protruding from their lower jaw, and fangs visible when they open their mouth. In fact, we see that ALL their teeth are sharp, such as when goblin cleric Redcloak shows off more chompers.
- The Grinch.
- Ren in Ren and Stimpy. Especially in "Ren's Toothache", where he refuses to brush his teeth and they eventually rot and fall off.
- In both Time Squad and Hudson Hawk, this is why Leonardo da Vinci ends up painting the Mona Lisa with a closed-mouth smile.
- In My Little Pony: Friendship Is Magic Nightmare Moon has fangs...which tend to look slightly creepy on a horse.
- The Terras in Motorcity.
- The Smurfs: The Legend of Smurfy Hollow gives us a nice close-up view of the few teeth that are left in Gargamel's mouth.
- The Joker, as mentioned above, got these in The Batman, which gave him a gaping mouthful of bright yellow teeth with jigsaw-like protrusions and holes, causing them to slot together in a highly unnatural fashion.
- The same series also gives these to Oswald Cobblepot, the Penguin, with a frankly shark-like array of jagged, pointed fangs.