Fang
Fangs – also known as eye teeth or canines – were a type of tooth, typically found in the top corners of the mouth's upper jaw.

In Humans, incisor teeth were believed to have been fangs at one point. In 2266, Doctor Robert Crater compared Humans' retention of incisors and a chameleon's ability to change color for camouflage to the M-113 creature's ability to change forms, saying it was a survival mechanism. ()

While visiting the planet Neural in 2268, James T. Kirk was attacked by a Mugato, who bit Kirk. When Kirk was thereafter attended by Doctor Leonard McCoy, Kirk ordered him to "Contact ship. Took full poison. Fangs." ()

Spock once clarified to Dr. McCoy, who had just heard of Spock's pet sehlat I-Chaya being referred to as a teddy bear, that "on  the teddy bears are alive, and they have six-inch fangs." ()

When explaining to Kes the description of the two-tailed talchoks of Rinax, Neelix described them as "Nasty little vermin. Sharp claws, dripping fangs. Ugh." ()

Following the consumption of the "beast" they hunted for lunch, Kor and Jadzia Dax embellished the story about the creature, describing it as having "fangs like daggers." () 

Captain Benjamin Sisko referred to Klingon teeth as "fangs," and mentioned how he missed them after having a Klingon disguise he had worn removed from him. Odo disagreed, saying that he, for one, wouldn't miss the fangs at all. () 

When the restrained Kira Nerys verbally confronted her deranged captor, Silaran Prin, he described her actions back to her as, "It bares its tiny fangs, hoping for a chance to strike, to sink its teeth deep into the flesh of its tormentor. But that chance will never come." ()   

In describing her ineptness with data algorithms, Tal Celes told Captain Kathryn Janeway that "To me [...] it's a monster with, [...] fangs and claws. In my nightmares, I am chased by algorithms. My brain just wasn't built to understand this." ()

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Anatomy