Tight spaces are the easiest places for plaque to build up and the toughest to clean, which can lead to gum irritation and gingivitis. The Oral-B cross Action advanced manual toothbrush is equipped with cross Action bristles, designed to remove plaque at the perfect angle for healthier Gums. The bristles flex and straighten to actively reach between teeth, clean along the gumline, and remove up to 96% of plaque in hard-to-reach areas leading to better dental check-ups for your whole family.