Assertion: electric toothbrush's pressure sensor | /r/CapableOf | vary whitening
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Source sentences:
text: Rechargeable power toothbrushes can cost $20-$200 depending on the type of cleaning action and options like a built-in timer (so users brush for the minimum recommended time); varying bushing modes like sensitive teeth, gum massage or whitening; pressure sensors to indicate when the user is brushing too hard; digital reminders to replace the brush heads; a docking or storage unit; or a UV sanitizing unit for the brush heads.