Preheat oven to 350˚F. Line a baking sheet with a silicone mat or parchment paper.
Chop the tomatoes into small pieces. Add to a colander placed over the sink or over a bowl to drain. Sprinkle with 1/2 tsp salt and toss to combine. Let stand for about 20 minutes.
Add oil, garlic, and red pepper flakes to a small skillet over medium-low heat. Cook until garlic is fragrant and browned, about 2 minutes. Remove from heat and allow to cool.
Brush both sides of the slices of bread with the garlic oil. Bake for 8 minutes, flipping halfway through, until golden brown.
Add drained tomatoes to a bowl with mozzarella pearls, remaining garlic oil, and basil. Season with salt and pepper to taste.
Top the toasted slices of bread with bruschetta. Drizzle with balsamic glaze. Serve.