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. www.spinbrush.com. Made in China.