Nothing is more depressing than having grey roots appear when your appointment is still a few days away. TouchBack is like a Magic Marker for your hair. Just apply to the hairline and it will stay put until the next shampoo—no flaking off or fading with brushing. Available in black; dark, medium, and light brown; ash and golden blonde; and light and dark auburn. $29.95 at http://www.touchbackgray.com.