You're thinking only about the end user - what I'm talking about is more encompassing than that. Toothbrush companies want metrics around their product. Users are going to soon be faced with a choice to either purchase a smart product that measures these metrics or buy the old cheaper one that doesn't. The way I expect mass adoption to occur is from the possibility of selling this data and passing off a percentage to the users. Your toothbrush will reward you for brushing your teeth not just with a nice sound or trivial leaderboard but by real world products, discounts, etc. If you always brush your teeth, you get notified that you can get your next toothbrush 40% off. The company will be able to do that because you gave them far more money with the data you provided them which they could sell to toothpaste companies, dentists, researchers, candy companies, etc There's a lot of parties who might be interested and this is hardly the best example.