For me, it’s an electric toothbrush. It doesn’t matter if you go with Sonicare or Oral-B, once you start using an electric toothbrush, regular toothbrushes don’t ever feel like they clean your teeth properly. The smooth plaque-free top layer of your teeth that you can feel after using an electric toothbrush can’t be replicated with a regular toothbrush.
My Roborock actually also went through diarrhea, but I was able to open it up completely and clean it up with a lot of rubbing alcohol and paper towels. Never had an issue with it again