Yes, it is expensive but it is worth it! It is one of those masks that you feel your hair rough after the first use, but this implies reconstruction! With the next uses, you start to see a big difference. Thicker hair, fuller and shinier. The scent is relatively strong but personally, I really like it! Keratin has anti-frizz properties, so it leaves the hair smooth and healthy. I would recommend it along with the keratin boost from the series as a treatment.