The Oclean P3K4-replacement head is rubberized to protect the gums. Small, compact, and rubberized brush head with fine fibers for better gum protection. The replacement brush heads for the Oclean toothbrushes have high-density and high-quality bristles that perfectly clean teeth and gums and remove plaque. Features of the Delicate Care replacement head: Smaller size - effectively cleans teeth and removes plaque from hard-to-reach areas Silicone blades on the back of the head for simultaneous tongue cleaning. Extra-fine premium fibers with fluoride.