Yup, exactly. They have things like whitening brushes that use a longer-than-2-minute cycle, and tongue cleaners that do a 30 second cycle. Switching the brus

Yup, exactly. They have things like whitening brushes that use a longer-than-2-minute cycle, and tongue cleaners that do a 30 second cycle. Switching the brush head switches the mode there. You can also switch manually with the buttons on the brush. Everyone in the Twitter thread seems really mad about the whole thing, but it's a fine use of NFC if you ask me. Remember, the brush is authenticating the handle with the password, not the other way around. This scheme is not useful for DRM, but is useful if you use more than one type of brush and if you want to be alerted when it's time to change your brush. I just change them on the 1st of the month, but if you want even more life than that, the feature is available. You aren't screwing over Sonicare by using a worn-out brush, you're just spending 2 minutes not cleaning your teeth.