Effective Clean: The design with long and brief bristles allows the Trustnice precision brush heads to surround the teeth and penetrate deep into the interdental spaces, cutting off 5X extra plaque alongside the gum line than with a manual toothbrush. High Compatibility : Trustnice brush heads are specially designed to slot 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 electric toothbrush head alternative work just to boot the original heads at an affordable price, each brush head has a coloured coated ring ideally suited for the complete kinfolk with out being confused. Gum protection: The finish of the bristles is rounded in order to now not injury the gums. The medium-hard alternative brush head presents the best steadiness between thorough cleansing and gum protection.