The tooth missing make me do a double take, either that's a great coincidence or he was really determined to get that cosplay as authentic as possible.
I dont think it matters too much judging by how noone actually seems to get mad at him and just either flips him off back or pretend to attack him in some way that is in character for whoever there supposed to be so im pretty sure there all in on it or they get the joke and know whats going on