Summit+® has strong unique tapered bristles that penetrate deeply between teeth and below the gum line where conventional bristles cannot reach. The Summit+® toothbrush cleans deep to remove plaque to help you achieve better gum health and a healthier mouth. Bi-Level bristles offer two levels of cleaning- below the gum line and at the tooth surface, while the angled bristles are designed to enhance cleaning by striking the surface in different directions. Unique tapered bristles penetrate deeply between teeth and below the gum line where conventional bristles cannot reach to promote gum health. Outstanding plaque removal. Unique tapered bristles clean 4x deeper below the gum line and 6x better along the gumline.