I have coworkers like this, where it seems like every time you see them they've got something in their teeth. And it's not always some speck of pepper or broccoli from their lunch. No, the festering lump of food caught between their teeth looks to have been there for days. It's hard to look them in the face, or concentrate on the conversation, since you keep thinking of dental floss and tooth picks.

Thanks for the photo, Mike.

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Of course, they don't have the excuse that naked mole-rats have. These rodents have their front teeth outside their lips, so that they can burrow with their mouth closed (such polite burrowing). I never thought of it before, but our lips also serve as squeegees for our teeth.