[jwcacces]

I also find these "features" despicable, however in Sonicare's case this one is mostly benign.

I also have a Sonicare toothbrush, and other then the head it came with, I only use generic heads on it. The "feature" you are talking about is called the "BrushSync" and it enables the "Brush head replacement reminder". That feature doesn't activate with generic heads, and you can easily turn it for Sonicare heads. Here's a link to the manual for my brush. See page 11 for the feature description and 12 for the instructions to turn it off. Depending on your model you may need to do a different sequence.

https://www.manualslib.com/manual/1507567/Philips-Sonicare-P...

Now, you might say that without reminders, I'm not getting the clean I deserve, but I buy heads with those fade away indicator bristles, so I just change it out when the blue turns white.

[wrycoder]

Thanks!