After a trip to the sun and a non-balanced pool chlorine level, the long blond hair of my daughter were burnt a disaster !!! They looked like rope and impossible to untangle, I thought him short overlap :-( A hairdresser cousin advised me, it's true that it's a little expensive but in 3 weeks, my hair daughter are again superb ;-) At first, I've put him in the evening and leave on all night and now after each shampoo .... I am convinced this is a real good product !!!!