It works happily with a brush head without NFC. That was the first thing I tried with my new toothbrush.
people skip brushing their teeth for all sorts of reasons. (yes you do. stop lying. your dentist doesn’t believe you, either.)
people go out of their way to not skip coffee.
Anyhow, blocking unofficial heads is just an OTA firmware update away.
Although the points don't go to Facebook - you get "rewards" for them. Eg:
> Pair one or more brushes to our iOS or Android app, then you’re all set. quip’s Bluetooth® Smart Motor will automatically store your routine, no phone needed! To check your brushing stats and the points you’ve earned, tap the app.
> Earn bonuses for never missing a beat! Redeem points for rewards you’ll love
https://www.getquip.com/store/products/smart-electric-toothb...
Also, how would you know? I have an IOT product that can delta OTA, so only the bytes of the firmware that change are sent to the device, I can do firmware updates that are crazy fast. ESP if it’s just something like turning a feature on.