Part of the reason

Part of the reason is the vibratory motion is automatic and relies on less manual dexterity, but another factor is the size of the heads. Many also have pressure sensors that light up when the user is pressing too hard, risking enamel damage. "But if you use a manual toothbrush and use it absolutely correctly in terms of brushing method and pressure and so on, then you will get an equally good result," says Hirschfeld.

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