Value Twin Pack Pulsating Toothbrush Interdental Deep Cleaning Power Vibrating Flex Head Pulsations Helps Break Up Plaque Flexible Side Bristles Pivot to Get Between Teeth The "i" in iPower stands for interdental because this manual sized power toothbrush uses a vibrating flex head pulsations to provide deep interdental cleaning power! Vibrating Bristles Penetrates deep between the teeth