The Sonic-FX™ is designed to be used with the Quadrant Method of brushing, which means you switch from one quadrant of the teeth to another every 30-seconds. Every 30 seconds, you'll hear a unique pause in the vibration indicating that it's time to switch. The brush will shut-off automatically after two minutes of brushing time.
My Sonic-FX™ makes a weird noise about every 30 seconds, is that normal?
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