Short answer; yes, they are [as per this study](https://www.dentalhealth.org/news/electric-toothbrushes-win-the-head-to-head-against-manual-in-record-breaking-new-study).
That said, a poor electric-toothbrush user will be worse off than a great manual toothbrush user. But for a specific individual, putting in the same effort, they will get a better clean with an electric toothbrush than a manual one.
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