@Legion_01 I think Itakagi Keisuke was just too lazy to properly draw the insides of his mouth in that panel and just made it a blank space lol.
And Igari sure is a sly fox lol. I recently got my wisdom teeth pulled and the week after that was just straight up awful so I don't even wanna imagine what these Baki characters have to go trough every time they lose their teeth in awful ways. But then, doctors in Baki are even more amazing than the fighters themselves so maybe it's not that bad!