In a new commercial firing back at Conservative attack ads, Liberal Leader Justin Trudeau says he’s proud of his credentials as a teacher and has worked hard to earn his place as leader of his party.

The new commercial from the Liberal Party of Canada comes just over a week after a Conservative attack ad suggested the former teacher is underqualified to become prime minister and is "in way over his head."

In the new ad, Trudeau is seen sitting on a teacher's desk in a classroom, with the Conservative-backed ad playing on a television in the background.

Trudeau picks up a remote control, shuts off the TV, and says, "Canadians deserve better."

"We can keep mistrusting and finding flaws in each other, or we can pull together and get to work," he says, dressed casually in a suit with a white shirt, no tie.

Trudeau goes on to say he worked hard to earn his role as the MP representing the Papineau riding, worked hard to "earn the trust of Liberals," and "now I'm going to work hard to earn your trust."

He also responds to the key message of the Conservative attack ads -- that his "famous last name" and a stint as a high school teacher do not qualify him to be prime minister.

"I'm proud to be a teacher. I'm a son but I'm also a father, and although I’m a leader I'm here to serve. I'm Justin Trudeau and together we will build a better country," he says in the ad.

In an email that went out to supporters giving them a first look at the ad, Trudeau said “the other side is trying to bury our message of positive change under an avalanche of negative attacks.”

“Let me be clear: we aren’t going to let them get away with it.”

Media expert Barry McLoughlin told CTV’s Power Play Wednesday that Trudeau tried to take the high road – and succeeded.

He said Trudeau’s tone and references to hard work and serving the country worked well.

However, the “nice guy” response may have boxed Trudeau in, he said.

“In the next two years, he’s going to have to take some shots against this government.”

Nevertheless, McLoughlin said the ad was “a decent shot, a decent response” from the new Liberal leader.