Zdeno Chara does not need a functioning jaw to skate, folks.
Per the team, Matt Grzelcyk was also on the ice for practice this morning, and he was wearing a regular jersey; this is a good indication that he's ready to go.
Officially, both are game-time decisions:
Per Bruce Cassidy, Zdeno Chara and Matt Grzelcyk are game-time decisions.— Boston Bruins (@NHLBruins) June 6, 2019
“They’re on the ice now, so that’s a good sign. We’ll see how they feel around 7-7:30 tonight.” pic.twitter.com/czYC3hpx0o
If both Grzelcyk and Chara can go, I still might dress 7 defensemen, just in case Chara gets a knock (which is a borderline lock given how St. Louis has been playing).