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A maximum of 2/4 bristle rows were in contact with the tooth surfaces; in some areas, the bristles had no contact to the teeth. Conclusions Uninstructed manual toothbrushing is superior to auto-cleaning. The alignment and density of the auto-cleaning device's bristle rows need to be improved, and assorted sizes would be necessary to cover different jaw shapes. Clinical relevance The auto-cleaning device has been developed to accommodate individuals with poor dexterity or compliance. To date, it is unable to provide sufficient plaque red