Retalick goes without one as well, Savea is notorious for not using a mouthguard. They both have bad teeth I can imagine if you have bad teeth it would be hard to get them to fit properly and be difficult to use but man I personally would never go without one. When I was playing i never went without one and if I lost it or forgot to take one to a game I simply wouldn't play. Imagine going into the contacts they do with no gob shield? I also noticed Perenara going without one in this game as well. Halfbacks spend most of their time barking orders and a guard would get in the way but still. Its not hard to trim one down and get one that doesn't hinder speech so much.