After I re-brushed my teeth with the correct toothbrush (I was afraid I made my teeth dirtier using the 'designated cleaning brush,' ironically), I laughed at myself.
It triggered an old memory where my sis and I incessantly giggled while my grandma brushed her hair at our dresser.
She finally asked, "What is it?"
"That's the brush we use on the cat HAHAHAHA!!"
Of course the brush was an old hairbrush we used on ourselves at some point, but was innocuously laying out next to the mirror among jewelry and socks.
This indicates either that history is doomed to repeat, or that I should store 'tools' in a way that makes them obvious they aren't to be used for hygiene.