Philips DiamondClean Smart sonicare HX9917/89, Manual

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b. Pressure sensor
Your Philips Sonicare is equipped with an
advanced sensor that measures the pressure you
apply while brushing. If you apply too much
pressure, the toothbrush will provide immediate
feedback to indicate that you need to reduce the
pressure. The feedback is given in two different
ways:
1 You experience a change in vibration and
therefore brushing sensation.
2 The pressure warning light of the light ring will
light up purple.
If you receive a warning, reduce the pressure. The
light will turn off and the brushing sensation will
adjust to the original sensation.
Activating or deactivating the pressure
sensor
1 Place the handle, with a brush head attached,
in the plugged-in charger.
2 Pressure sensor is enabled by holding the
mode/intensity button and by pressing the
power button twice while on a charger. The
handle will beep twice to confirm it is enabled.
3 Pressure sensor is disabled by holding the
mode/intensity button and by pressing the
power button twice while on a charger. The
handle will beep once to confirm it is disabled.
c. Brush head replacement reminder
Your Philips Sonicare is equipped with a smart
feature that tracks the wear of your brush head.
Depending on the pressure you apply and the
amount of time used, the brush head replacement
reminder light reminds you to change your brush
head. It is important to change your brush head in
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