Soft-flex bristles. Designed for sensitive teeth. Longer, more flexible bristles. Precision brush head. Color-wear bristles. Also fits: ProClean; Pro Whitening. Arm & Hammer: The standard of purity. Color-wear bristles reminds you to change your brush head every 3 months (or when blue bristles on spinning head fade). Time to replace! Pro Sensitive: Arm & Hammer Spinbrush Pro Sensitive is a battery-powered toothbrush with innovative sensitive bristles. With regular brushing, it's designed to clean without irritating gums and teeth. Single oscillating head for cleaning hard-to-reach places without irritation. Sensitive bristles designed to clean without irritating gums and teeth. Made in China.

Operating: 1. Slide switch up to turn on brush. 2. Gently glide bristles back and forth against the teeth/gum surfaces without pressing hard, for about 2 minutes while brushing your teeth. Brush head is replaceable. Replace brush head when blue bristles fade, or after 3 months of use. To Replace Brush Head: Twist counterclockwise 90 degrees and pull away from handle. Slide on new head and turn clockwise 90 degrees until arrows are aligned. Rinse toothbrush head thoroughly after each use. Twist off. Twist on.