How does the pressure sensor feedback work on my Sonicare?
Resetting the pressure sensor settings
If you are unsatisfied with the pressure sensor settings, it is possible to re-calibrate them. To do so, follow the steps below:
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Ensure that the charger is plugged into an outlet. Remove and place the handle on the charger for at least 45 seconds.
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Remove your handle from the charger. Repeat this step four additional times.