The AuraOne's sonic motor runs at 150 to 250 Hz and combines a sweeping motion with vibration, which is what gives it that polished-feeling clean along the gumline. What sets it apart is the head: DuPont bristles anchored with a copper-free process, sitting on silicone shock-absorbing pads with a soft rubber back, so the high-frequency action reaches the gumline without the scrubby harshness of cheaper sonic brushes. Five modes cover everyday Clean, a gentler Soft, a stronger Strong, a stain-focused White and a smoothing Polish. In our evaluation the clean felt consistent from a full charge to the low-battery warning.