After using the Beautyzzz pillow case for about 3 weeks, I noticed a dramatic difference in my hair: it seemed stronger! Others noticed, too, and they commented on how shiny my hair was! I originally began sleeping on this pillowcase as a preventative measure at the recommendation of a friend, but I never expected it to make such a difference in my appearance! I highly recommend this product to anyone with brittle or dry hair; it really helped me improve my hair's appearance.