Breakthrough Technology reduces grey a little bit with each shampoo for subtle, gradual results. use daily until you like what you see, then regularly to maintain the look you like. It never gets rid of 100% of your grey so the look is always natural. Relieves scalp itch, dryness, irritation and help prevents flakes while it cleans. Increases volume for a thicker, fuller look. DO NOT USE on hair that has been lightened, bleached, highlighted or coloured