Innovative clean. Improves oral health in 2 weeks (By reducing gingivitis in a short term clinical-trial). Individual flexing sides! Oral-B. Trust the brand more dentists use themselves worldwide. How Does Clinical Pro-Flex work? Clinical Pro-Flex has flexing sides that adjust to the unique curves and contours of your teeth, including gumline, for a superior clean vs. an ordinary brush. (with regular use). Because of its flexibility, clinical Pro-Flex is gentle on gums too. Also try Crest Pro-Health toothpastes. For more oral care information visit: www.OralB.com or call 1-800-56-OralB (1-800-566-7252).