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Does the brush stop working with the head when that lockout happens, or does this just break the "buy a refill please" functionality?

For my older Sonicare (with a larger brush head base), I've found it easiest to just write "Q1," "Q2," etc. with a sharpie when I replace the head.

I own a Sonicare. All it does is vibrate and blink shortly after you are done brushing when it's time to "refill"

It doesn't even do that after every time you used the head "too much". Not sure how much it reminds you.