For the first time since the 2007-08 season the Bruins were swept in their regular season series with the Montreal Canadiens.

The Canadiens completed the sweep thanks to a 3-1 victory against the Bruins Sunday night. The Habs outscored the Bruins 15-6 in the four games they skated against the Black and Gold this season.

With two Canadiens wins inside TD Garden this season, the Bruins have not beat their longtime rivals on home ice in the regular season since January 12, 2012. No one on the B’s can seem to figure out what it is that causes them so much trouble against the bleu, blanc et rouge.

“Yeah, I don’t know. I think if we knew we would change, I guess, right? I don’t know what it is,” defenseman Dougie Hamilton told reporters postgame. “It’s the matchup against them, obviously isn’t good for us. Just the way it is, I guess.”

The Bruins now trail the Canadiens by eight points in the Atlantic Division. Montreal has one game in hand on Boston.

With the loss, Tuukka Rask’s career record falls to 3-13-3 against the Canadiens. Three of the four losses to Montreal this season have been charged to Rask as the reigning Vezina winner has allowed nine goals in those setbacks.

At the end of the day Rask knows the group needs to be better against a team that simply has the Bruins number. According to Rask, doing that is a simple formula.

Related: Rask hung out to dry in loss to Habs

“It’s just about executing the game plan and playing our hockey and not too many mistakes out there,” said Rask. “That’s about it, you know, creating some goals.”

Thanks to the new playoff format, the Bruins are going to see the Canadiens in the Stanley Cup Playoffs quite a bit these next few seasons. If the B’s have plans on raising the Stanley Cup again anytime soon, they know they will need to solve the puzzle that is Carey Price and the rest of the Habs.

“We’ve just got to stick to our game plan. If we continue to get pucks in deep and try to work down low then we’re a good team,” said Brad Marchand who was on the ice for all three Montreal goals. “We’re tough to play against, but as soon as we start trying to play like them and then make plays at the line and stuff like that we turn it over and that’s where they capitalized.”

A lot of people want to point to the speed of the Canadiens’ pesky forwards as to the main reason why they give the Bruins a fit, but head coach Claude Julien is sick of hearing about their speed.

“Well, it’s like the speed of New York seemed to be an issue for us in New York. It wasn’t an issue for us here. The speed of the Islanders weren’t an issue for us either,” the eighth year Bruins bench boss said. “When we don’t play our game the speed is an issue, and tonight we didn’t play our game so it will always be an issue when we don’t play our game, so that’s one of the main reasons here

“Why is it not an issue when you play the Islanders? Last night we out chanced them. We had more chances than them. They’re a pretty fast and skilled team, yet when we play our game and we defend well we turn pucks over and we go back on the attack, and when you don’t win battles like we didn’t tonight then they spend a lot more time in your own end.”

Are the Canadiens in the Bruins head, and becoming a psychological challenge?

“It can’t,” added Julien. “We can’t allow it.”