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.
Venta LW45 humidifier. easy to clean, uses like 8W/hour (compared to ~40 for ultrasonic or 300 for electric heating ones), quiet, goes through a 9l tank per day easily. And has almost no part that could break i.e. i could replace whatever could break easily.
but the price is insane for what amounts to a bucket with a fan