Scary Teeth

The Scary Teeth is a TV-Tropes-popularized term about typical characteristic of a character, includes a villain whose dentures looked disturbing if they revealed it. Reasons are vary, ranging from: In either way, having scary teeth would made a character's smile would disturbing and even instilled fear or warned the heroes/protagonists the indication that trusting the said character is debatable.
 * Being rotten as result of poor hygiene.
 * Having a mouthful of sharp teeth similar with that of carnivorous animals like sharks, lions, etc., due to either malformed when born or naturally (should one is not a human).
 * A number of teeth to whole tooth replaced with durable fake teeth/fake tooth that made one's grin scary due to material used or models.
 * No longer have teeth, either due to the poor hygiene or worse, injuries by either accident or fight with a hero.