Neither the Raptors nor the Bucks are playing defense nearly as well as last season. Toronto gave up the fewest points per game in the NBA last season, while Milwaukee surrendered the eighth-fewest. 
So I understand why the oddsmaker has set such a high total. The teams just met two days ago in Milwaukee and Toronto won, 124-113. The combined 237 points just grazed above the posted number of 235 1/2. Before Tuesday's game, the Under had cashed the past six times between the Raptors and Bucks. I believe the Under goes back to cashing again in this quick turnaround matchup. 
It's not like Toronto and Milwaukee suddenly have stopped playing defense. They both are in the top 12 in defensive field goal percentage. 
The Raptors were hot on Tuesday making 51 percent of their shots from the field and 40 percent of their 3-point shots. Toronto shoots 45.3 percent from the field and 38 percent from beyond the arc. The teams shot a combined 46 free throws, too. That's what it took for Tuesday's total to go Over. 
The Bucks are in stop-the-pain mode losers of four in a row. Their offense has been down averaging 112 points during the past three games. That's eight points fewer per game than what they average on the season. Point guard Jrue Holiday has been missed. The Bucks haven't had him the last five games due to COVID-19 protocols. Holiday is eligible to play today. If he does, he's likely to be rusty. I'm expecting an intense defensive effort by the Bucks to offset their offensive downtick. 
Toronto may not have point guard Kyle Lowery. He suffered an ankle injury during Tuesday's game. The Raptors did get back OG Anunoby after a 10-game absence. This is a plus for the Under. Anunoby is a versatile defender who has the ability to effectively cover a big man like Giannis Antetokounmpo, or a very good wing such as Khris Middleton.