Trent Frederic made it 4-1 at 12:31, but Forsling scored 27 seconds later from long range to cut it to 4-2 at 12:58.
White stuffed in a rebound at the crease at 18:23 to make it 4-3, but DeBrusk scored an empty-net goal at 18:57 for the 5-3 final.
"I was shocked at how smart a player he [DeBrusk] is, and his ability to make plays," Montgomery said. I knew he could score goals, I knew he could skate. I didn't know he could make as many plays as he does, and I think his all-around game is continuing to develop."
The Panthers will host the Philadelphia Flyers on Wednesday after opening the season with a three-game road trip.
"Anytime time you go over 50 percent [in points percentage] on the road, it's nice," White said. "It's going to be nice to get back home now and play three games there.
NOTES: Brandon Montour (upper body) was a late scratch, which left the Panthers with four defensemen following Ekblad's injury. Maurice said he does not believe Montour will be out long term. … Bergeron scored his 402nd goal, tying Rick Middleton for third in Bruins history. Only Phil Esposito (459) and Johnny Bucyk (545) have more.