Leon Draisaitl scored, and Stuart Skinner made 20 saves for Edmonton (2-4-0), which had won two straight games.
"I thought we were really good at the start of the game," Edmonton coach Kris Knoblauch said. "I thought the turning point was when they had their first power play. The first 20 (minutes) definitely, our pace was good, we were checking really well, and just couldn't capitalize. Just couldn't get the puck in the net. We had two power-play opportunities and had some chances, they didn't go in. They get their power play and score right away. That was a big turning point of the game."
Duchene scored a power-play goal to give Dallas a 1-0 lead with 26 seconds remaining in the second period. Hintz won a face-off and passed the puck back to the point where Duchene shot from the high slot to beat Skinner glove side.
"The first goal was obviously critical," Dallas coach Pete DeBoer said. "We got our legs as the game went on. I didn't like our first period (outshot 11-2). When I look at our schedule, I think it was six games in nine or 10 nights. Afternoon game coming off the road in Washington (3-2 loss on Thursday), I expected we may be a little off tonight. [Oettinger] held us in early until we found our legs."
Duchene scored his second of the game at 12:06 of the third period to give Dallas a 2-0 lead when Mason Marchment found him driving the net front on a pass from the top of the goal crease.
"I saw him coming. I was just kind of waiting to see if that other defenseman was going to come at me and he ended up coming," Marchment said. "I knew [Duchene] was going to be there. He did a great job of putting it in the net."