Chicago's top defenseman lost seven teeth and suffered cuts around the mouth in the second period, but returned to help lead the Blackhawks to a 4-2 victory over San Jose to complete a four-game sweep.
"Dunc's got guts," said teammate Dustin Byfuglien, "but that's not something we didn't already know."
Manning the point of Chicago's power play in the second period, Keith took a puck to the face on a clearing attempt. He immediately began bleeding and skated to the home team bench, where he was taken for repairs by the Blackhawks' training and medical staff. Patrick Marleau scored seconds later to give the Sharks a 2-0 lead.
With the damage temporarily patched up, Keith returned before the period was over and had an assist on Dave Bolland's game-tying goal at 18:38 of the second.
"He had a great third period," said Blackhawks head coach Joel Quenneville. "He's a battler, a warrior. We certainly missed him through that stretch. But his quickness, his puck pursuit, the way he defends just complements our whole team game."
Keith, who said two of his seven lost teeth were fake and he was in for a "long night in the dentist's office" on Sunday, vowed to do whatever it takes to help Chicago claim its first Stanley Cup in 49 years.
"I will take all my teeth out if we continue winning in the playoffs," said Keith.