Effective Clean: The design with prolonged and short bristles allows the Trustnice precision brush heads to enclose the tooth and penetrate deep into the interdental spaces, removing 5X more 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 replacement paintings easily to boot the original heads at a reasonable price, every single brush head has a coloured coated ring excellent for the entire kin with out being confused. Gum protection: The end of the bristles is rounded in order to not harm the gums. The medium-hard alternative brush head gives the ideal balance between thorough cleansing and gum protection.