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.
Most (though not all) in the UK since at least the 90s are plastic except for the heating element and electronics, microplastic concerns aside they’re considered more efficient since it’s a better insulator. Regardless of material every home has one I can tell you that.