The very large, thick teeth located throughout the mouth of the Nydus Worm primarily serve as digging tools. Each fang is connected to a set of powerful muscles, which vibrate at hypersonic speeds in order to crush soil, rocks and everything in between. Eventuallymainly due to frictionthe worms teeth wear down. Once a tooth becomes useless, it is ejected and a new one grows from the muscle itself in a matter of seconds.