Oral-B Cross Action Vitalizer features soft gum stimulators that are clinically proven to reduce gingivitis by gently massaging gums; CrissCross bristles: Positioned in opposing directions and are designed to flex and then straighten, actively penetrating between the teeth and along the gum line to lift out and sweep away plaque; Soft gum stimulators: Two rows of soft gum stimulators positioned on either side of the brush head gently massage the gums; Power Tip bristles: Positioned at the fro