Effective Clean: The design with prolonged and short bristles allows the Trustnice precision brush heads to surround the teeth and penetrate deep into the interdental spaces, removing 5X extra plaque along the gum line than with a instruction manual toothbrush. High Compatibility : Trustnice brush heads are specifically designed to fit Oral-B iO toothbrushes, Brush Heads Compatible with Oral b IO 3/4/5/6/7/8/9/10 Electric Toothbrush. Affordable and Chic Mix: The electrical toothbrush head replacement paintings simply in addition the unique heads at an affordable price, every single brush head has a coloured coated ring supreme for the whole family with out being confused. Gum protection: The finish of the bristles is rounded as a way to no longer damage the gums. The medium-hard substitute brush head gives the perfect balance between thorough cleaning and gum protection.