Talk:Sans/@comment-11406962-20151215002444/@comment-27866698-20151215140809

yeah! that's right! Sans and Papyrus just can move the corners of their mouth as well as their eye sockets but since they have no lips they can't do much it. They are always showing their teeth :D

Also I think Sans looks like he only shows the upper row of teeth but I think that is just design choice. Sometimes in anime they do that but it actually means that they both rows, you just cannot see the divisions.