Studies have also shown power toothbrushes better remove extrinsic stains caused by coffee, tea and tobacco than manual brushing and thus promote tooth whitening; a feature particularly important to many patients. Terézhalmy, et al. studied the impact of using an oscillating-rotating power toothbrush in study participants with existing stain, compared with a dental prophylaxis followed by brushing with a manual toothbrush. After two weeks, the power toothbrush produced effective stain removal (>90%) comparable to that of the oral prophylaxis with manual toothbrushing.32
These investigators subsequently evaluated the stain-removing capabilities of two sonic toothbrushes in subjects with pre-existing stain, and found both brushes to provide highly statistically significant reductions in stain following two weeks of twice daily use.33
Clinical research has also shown that an oscillating-rotating power toothbrush can control dental calculus (tartar) formation. In a crossover trial comparing a manual toothbrush, a sonic power toothbrush, and the Braun Oral-B 3D Excel, the Oral-B oscillating-rotating brush was the most efficacious, yielding a 63% reduction in calculus from baseline.34
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