amplebrain

Interesting talk. Love the multiple examples of the same concept!

I suppose the difference is what they use the data from the toothbrushes for. OralB produces pretty dashboards with the information while this is a game. I suppose this is closer to your rainbow example.

Another difference would be that this is not a toothbrush in itself so it can be used with multiple manual toothbrushes.

I would agree that holding the smartphone in the other hand is a bad idea. It would be better to prop it up against something or use one of the bathroom kits showed in the video on the page.

There are bathroom kits to prevent damaging the smartphone. I think there is a video of it being used somewhere on the page too (The demo video)