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.
Not arguing, but I don’t think I’ve ever even seen a plastic one. Mine has a plastic lid, but the inside is still sheet metal. I can’t even imagine one with plastic parts that aren’t just cosmetic. Plus they’ve got to adhere to some kind of safety regulations lest they be penalized by some federal agency. 🤔
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.