Roommate Used My Toothbrush to Clean

I caught my roommate using my toothbrush for the weirdest thing. Last week I came

home early and heard strange noises from the bathroom. I walked in and found him scrubbing

the grout between tiles with my electric toothbrush. He looked at me completely unbothered

and said he'd been doing it for months because it works better than a regular brush.

I was horrified. That explained why my toothbrush always seemed to die faster than it should.

He then casually mentioned he also used it to clean his keyboard and the cracks in his

phone case. I immediately threw it away and bought a new one that I now keep locked

in my room. The worst part is he genuinely didn't understand why I was upset.