I'm still trying to figure out why people need a battery powered toothbrush over a conventional one, let alone one that needs apps and verifiable replacement heads.

I'm surprised this is the only comment that critizies the fact that now the brush head contains not just plastic but also a microchip. That can't be good for recycling. Not to mention the wasted resources during production of the chip.

We need a law like EUs USB-C law, except forbidding non-Qi wireless charging unless you have a significant technical advantage over Qi.

Then we'd always have a charger.

For reminding you to buy a new head.

Complaining about RFID wasting battery in a mechanical device is either misinformed or intentionally reaching for bogus arguments.