> What they know is how long the toothbrush is on. How are they going to monetize that data?
"We noticed that brushing takes you X seconds longer than usual. Do you want to buy new bristles for your tooth brush?"
"We noticed you haven't used our tooth brush in a while. Do you want to buy our new tooth brush?"
"We noticed that you started brushing your teeth earlier than usual. This probably means that you started a new job and can afford our new deluxe premium tooth brush."
"We noticed that you brush your teeth later than usual. That probably means that you met with someone who you can recommend our amazing tooth brush to."
"We noticed that your tooth brushing times are all over the place, so you probably had a child. Buy our new baby tooth brush."
And that is just from the time you brush your teeth. However, the app also collections "Health and fitness and Device or other IDs" according to the app description:
https://play.google.com/store/apps/details?id=com.pg.oralb.o...
That means that Oral B can link that data with the data harvested from other apps or data brokers, so they probably know everything about you. Health data seems especially creepy to me. I wonder if it is possible to measure the effectiveness of an advertisement from the heart rate data. At least they can definitely tell if you brush longer after seeing their latest Oral B add on TV/YouTube/some website.