It was the third goal of the season for Jagr and the 668th in an NHL career that began in 1990.
Dallas has won back-to-back games for the first time this season. Edmonton suffered its fourth loss in a row.
Justin Schultz produced a power-play goal for Edmonton midway through the third.
Kari Lehtonen stopped 27-of-29 shots to pick up the victory. Devan Dubnyk suffered the loss while making 25 saves.
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