Preheat grill or broiler.
Place bread slices on grill rack or baking sheet; grill or broil 2 to 3 minutes on each side or until lightly browned.
Rub 1 side of each bread slice with 1 garlic clove half and 1 tomato half (tomato pulp will rub off onto bread). Discard garlic and tomato peels. Drizzle oil evenly over bread slices; sprinkle evenly with salt and pepper.