The North London outfit welcome the Canaries to White Hart Lane tomorrow, and Dembele believes that he and his teammates need to draw on their home advantage during the clash.
"Norwich are a good team and we have a lot of respect for them," Dembele told the club's official website. "We didn't have a lot of success against them last season and we know it will be tough.
"They have bought some good players as well, players I know from the Dutch league like Leroy Fer and [Ricky] Van Wolfswinkel, so they have improved, but we are better as well and at home, we need to make the difference."
Spurs currently sit sixth in the Premier League table, with as many points.