4 Stars! I know this is supposed to be for damaged hair, but it does WONDERS for prevention as well. I use the product every 8-weeks and since I've started using it (past 6 months) I have noticed a great deal of length retention, less hair breakage and overall stronger, healthier hair. This product contains animal protein (so the vegans amoung us this is a no go)....and it stinks to the high heavens. BUT....if you have hair that is breakage prone...this I would def recommend this treatment to you!