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Some rotate to clean your teeth, while others vibrate. And some have features such as a timer or pressure sensor. Electric toothbrushes can basically be divided into three categories. Oscillating rotary toothbrushes have small circular heads that rotate back and forth to clean each tooth. They typically oscillate laterally several thousand times per minute, and also rotate back and forth at a 50° to 70° angle, according to German consumer watchdog Stiftung Warentest. Some have a pulsing feature as well. “This is meant to dislodge more dental plaque,” explains dentist Dr Stefan Zimmer, a professor in the Department of Dental, Oral and Maxillofacial Medicine at Witten/Herdecke University in Germany.

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