When I see someone, anyone...including strangers, with food in their teeth, I generally let them know, because Heaven forbid that they walk around with food in their teeth all day! Sure, it is all part of this 'looking good in front of people' idea that we all seem to have in our minds....but that is not the point. The point is, that I would hope someone would tell me if I had food in my teeth, or that my fly was down. That is the hope anyway, right? So, what do you do when someone joins you in the library at your table who smells like last year's socks and team jersey?