page_title: Electric toothbrush
section_title: Sonic toothbrush
hierarchical_section_title: Electric toothbrush / Sonic toothbrush
caption_attribution_description: English: Sonicare sonic toothbrush
context_page_description: An electric toothbrush is a toothbrush that makes rapid automatic bristle motions, either back-and-forth oscillation or rotation-oscillation, in order to clean teeth. Motions at sonic speeds or below are made by a motor. In the case of ultrasonic toothbrushes, ultrasonic motions are produced by a piezoelectric crystal. A modern electric toothbrush is usually powered by a rechargeable battery charged through inductive charging when the brush sits in the charging base between uses.
  Electric toothbrushes can be classified according to the frequency of their movements as power, sonic or ultrasonic toothbrushes, depending on whether they make movements that are below, in or above the audible range, respectively.
context_section_description: Sonic toothbrushes are a subset of electric toothbrushes with movement that is fast enough to produce vibration in the audible range.  Most modern rechargeable electric toothbrushes from brands such as Sonicare, FOREO, and Oral-B fall into this category and typically have frequencies that range from 200 to 400 Hz, that is 12,000–24,000 oscillations or 24,000–48,000 movements per minute.  Because sonic toothbrushes rely on sweeping motion alone to clean the teeth, the movement that they provide is often high in amplitude, meaning that the length of the sweeping movements that they make is large. One study found that using sonic toothbrush causes less abrasion to the gum when compared to the manual toothbrush.
caption: Sonic toothbrush (Sonicare)
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