This is the first reviewI have ever written, although I like to read them. Time to give back. I am a total product junkie when it comes to hair and skin. Tried and used all of the most expensive brands. For hair I most often use Kerastase, Redken, Alterna, Pureology. I really like Alterna Caviar Moisture Shampoo and Conditioner for my hair, probably the best I tried. When used together you get amazing results. Well, back to Chronologiste. My hair is fine to medium, very fine in the front around my face from all the highlights and more thick towards the back. It is naturally dark blonde/light brown with a bit of wave, which goes away the more damaged the hair gets. I get highlights about 3 times per year. Am 35 years old. That is the situation. The biggest problem I have with my hair is that the front gets too damaged and weak and very limp and since I like it light around my face, it is a never ending cycle of highlights and breakage. Also, I like it wavy, which almost never happens anymore due to the damage. Like the nice addict I am, I had to buy Chronologiste to try, even for the price. It comes in a very nice box and the directions are pretty straight forward. Mix the cream with the pearls, wash the hair, towel dry, apply, rinse after 5-10 minutes. I washed my hair with clarifying shampoo as I always do before doing a treatment. I think it is very important to get all the junk out of the hair so the treatment could do its magic, I would advise not to skip this step. Pureology makes a really good clarifying shampoo, which protects colored hair. Then I towel dried my hair for a bit and applied the treatment. I do think that the reviewers who did not see a difference did not apply it very well. There is a video online, I think on Kerastase website even, that shows you how to do it. It is important to take the time with it and really work it into each hair strand. Starting with scalp just like you would apply color, part the hair and apply and keep doing that until the whole scalp is covered. Massage very well with slow motion. Then do the same thing for hair and massage the mask into every single hair making sure it is saturated. I gently brushed each section of hair at the end to make sure every hair fibre is taken care of. The whole thing did take me good 15-20 minutes to do. I was fine with the exact amount that Kerastase recommends using, did not skimp. My hair is long below my shoulders so maybe somebody with shorter hair could use a bit less. With this amount it would last me 10 treatments. After I was done I waited about 12 minutes, emulsified with a bit of water, massaged again and rinsed. I did nothing to my hair afterwards at all to see the real difference. Did not brush it, did not put any product in it at all, not even my beloved Elixir Ultime. Just let it air dry. Well, what can I say? I did this in the evening and really liked the results when it was drying. I was very happy. The real shock though came this morning. I slept with my hair in a loose bun. When I woke up and let my hair loose, I could hardly believe this. After one single use of this treatment, my hair was light, bouncy, wavy, shiny and with tons of volume, especially at the front! Totally unheard of for me lately. It is keeping its style like I went to a hair salon to get it done, think Jennifer Anniston when she wears it wavy. Really impressed. I have not had this kind of a hair day for about 10 years. And this is after only one treatment. I am persuaded the effects will be cumulative, it makes sense. I noticed my scalp is very happy since all the little bumps I would get lately, especially around my face are totally gone. I think this really takes care of the scalp, which means you will have healthier and denser hair. And the longer it is used, the more time will the scalp have to make progress. I noticed people had the best results when used weekly, which is exactly what I will be doing. That way the scalp and hair will always be in the best condition and protected. I am sure my hair will be only getting better from now on and I would recommend the treatment to every hair type out there. Just make sure you really apply it correctly and take the time with it. For this kind of money, it just makes sense, you know? Highly recommended from me, will always buy it from now on. Even for the high price. I hope this helps.