The HN title makes it sound like Toothbrush is their brand, and with the appropriation of common terms for the sake of the brand, I bought it.

I would be disinclined to use it. It reminds me of the Astral Codex Ten Article about the Midjouney Scanner https://www.astralcodexten.com/p/preliminary-thoughts-on-the... , as well as those who've had problems with AirPods. https://discussions.apple.com/verify-human/verify.html?next=... (42 pages) What sounds the most amazing in a press release is often not the most medically sound.

Edit: it's hard to find clear info on the risks of improperly using an electric toothbrush or even on overbrushing, let alone the Dyson one, in part because a lot of search results are blogspam. Hopefully if the Dyson one is stronger, they don't use that to give it a default that is too much pressure, whether of water or moving bristles. I don't know that water pressure would cause enamel to come off. As for pressure using bristles, there is a point of pressure at which the cleaning effect stops increasing, and it is better not to go beyond that. Right now it's unclear to me whether the Dyson toothbrush works especially well or not.