Clinically proven to whiten your teeth by 3 shades thanks to its unique natural baking soda formulanew arm hammer advanced whitening is clinically proven to whiten your teeth by 3 shades the baking soda particles dissolve to gently clean away both surface and deep stains whilst neutralising odour causing compounds for long lasting fresh breath protection the advanced micropolishers safely polish to leave your teeth brilliant white with that fresh from the dentist feeling of clean