The Y-Brush Adult Replacement Brush easily adjusts to best brush your teeth. The 35,000 nylon filaments allow for more effective tooth brushing than standard brushing. A highly flexible "Y" shaped brush made of nylon filaments angled at 45 degree to remove plaque from between the teeth and care for the gums. Validated by in vitro and in vivo tests. , , Designed in collaboration with health professionals, Y-Brush has successfully passed numerous effectiveness tests. It allows a good oral hygiene and healthy teeth for a bright smile! The brush is to be renewed every 6 months, its 35,000 nylon filaments effectively remove plaque from all teeth simultaneously, in just 10 seconds. Expert in oral health in France, Y-Brush reinvents and revolutionizes the way to brush your teeth, taking care of your health and that of the planet. A quality at the cutting edge of technology!