When Mauvais Dentes woge, they grow gray fur over the head and arms, and they develop stripes and enormous teeth capable of leaving puncture wounds in their victims up to an inch in diameter.
They are incredibly strong creatures, able to casually overpower grown men; one was able to kill three men at once and was later shown to be capable of holding his own against two Grimms for a short time. ("Bad Teeth") ("The Kiss") They are highly agile, capable of jumping incredible heights, and are extremely fast, and stealthy. They possess razor sharp teeth and claws that they can use to kill. When they kill, they lacerate their victims and bite their necks. They are also very durable; one was able to take multiple punches to the head without much reaction.
Mauvais Dentes eat humans, or rather parts of them, as evidenced by Marnassier's behavior aboard a cargo ship. It is unknown if human flesh is part of their necessary diet, or if this is simply a bloodthirsty habit.
