CaCO3 Micrawhitening Technology. Whitens and removes stains. The Hard to Reach Places toothbrush. Calcium Carbonate (CaCO3) Micrawhitening Technology whitens teeth and removes stains (in lab tests). CaCO3 Micrawhitening bristles. Precision grip handle. Angled neck. Tongue cleaner. Soft thumb rest. Use Reach Total Care and Listerine Total Care for better oral hygiene versus brushing alone. Reach. The Hard to Reach Places toothbrush. Specially designed to clean your mouth with its angled neck and tapered head.