When I was a CNA I really prided myself on getting all my client's treatments done (long-term home-health type setting). We had a woman who, in her kitchen cabinet, had a kind of variety of brushes and pastes and stuff. I was always really good about making sure she scrubbed her dentures and teeth up nice and clean. Couldn't figure out why she had funky-looking brushes though, along with regular toothbrushes.
A couple weeks of this pass before I learn that this lady has a glass eye and I've been brushing her teeth with the same brush they use on day shift to SCRUB HER EYE GOOBERS OFF OF HER GLASS EYE.