Quote Originally Posted by Buffalobiian View Post
Nezuko's muzzle is also largely a gimmick since it serve no real purpose... and if she wanted to eat someone she has the strength and intelligence to remove it.
You sure? She drools like crazy in berserker mode. It gives her something to bite on, if nothing else.

It serves the same purpose as a piece of wood wrapped in leather. "Bite down on this." [pours iodine on deep wound, prepares bone saw for amputation]