This is a great hair oil. I have very long, fine, straight hair that is prone to split ends, breakage, and dryness. I try to use a hair oil once a day on the ends of my hair, and the Kerastase Elixir Ultime is one of my favorites. I only use a very small amount (less than dime sized) and go over my ends. It is hydrating and makes my hair look healthier and shinier. It doesn't help seal my split ends, but it's not meant to do so. I absolutely love the fragrance of this hair oil. It smells slightly floral and woody, with a touch of sweetness. The scent doesn't last for a long time, but it does linger on my hair for a little while. Overall, I highly recommend this hair oil!