Spit take Q: I work in a small library. My co-worker has braces, and, after eating, she brushes and flosses using the sink in the break room. I find this gross. Several months went by before she realized her toothpaste was flicking off her electric brush all around the sink. She seems more mindful about cleaning up after herself now, but I still think this is gross. There are four single, all-gender restrooms in our library, but she doesn’t seem to want to use them. There is also a sink in the lactation room, which I mentioned to her, but she doesn’t seem to use that either. I find this co-worker annoying in general, and I realize this might be why I find her brushing in the open so foul. — K.E. A: I am of the strong opinion that mouths and teeth should remain inconspicuous and unobtrusive in professional contexts, outside of their necessary deployment for communication.…