Remember in the Son of Batman comics when Damian lost a baby tooth during a fight with Maya? Well, since it’s canon that he’s still losing baby teeth, imagine the batbros helping Damian out with a loose tooth:
Dick would be practically squealing with joy at how cute it is that his baby brother has a loose tooth, and he would try a bunch of complicated and creative strategies to get it out. Like eating ten apples in a row, attaching the end of a string to the batmobile, and shooting it with a nerf gun, none of which worked.
Tim, after laughing for an hour at the fact that the demon spawn still has baby teeth, goes with the classic doorknob trick. Unfortunately, this kid has surprisingly strong teeth, and instead of the tooth coming out, when Tim shut the door it dragged Damian along with it until his face hit the wall. And even then, no success.
Jason straight up punched him in the face before he even finished the sentence. That did the trick, and Damian wound up with $2000 under his pillow in the morning, courtesy of The Tooth Fairy aka Alfred.