Really big difference. For those who write negative comments, they are wrong. Just because we have damaged ends doesn't mean it's the same for everyone. We need to find the reason and what our hair needs at that particular moment. I made this mistake too and was buying the wrong products and they weren't helping my hair. With the help of a specialist, I understood what my hair needed at that particular moment.

In less than a month of use, after each wash (every 2-3 days), my hair, which is long, fine, and straight, regained the volume, shine, and luster that it had started to lose (due to dyeing, age, and also covid!)
Besides that, split ends have almost disappeared and you can visibly see the hair is stronger.
I use it in combination with the nutritive shampoo and hair mask from the same brand plus a more affordable oil for the ends. This way, I ultimately avoided getting a haircut.
The only downside of this particular product and generally of Kerastase is their price... I got them on Black Friday.

Very good product. It helps the hair to grow longer & not have split ends. The downside is that it has very little product inside. It is very expensive for the amount.

Defective packaging and for its price, the quantity inside is minimal! I regret buying it! From me, a big NO

Shocking! I bought this cautiously and applied it to my hair that was damaged after highlights. My hair regained its shine and found its strength and shape again. It's worth every penny it costs

I have of course bought the spray and the oil and the mask and the conditioner and the restructuring shampoo, but all of these together, if you follow the instructions, work wonders. After the 3rd application, they started to shine, to detangle more easily, to be elastic and voluminous. It smells wonderful, I am very happy with my hair now. Of course, if you have damaged hair from dyeing, it's not worth getting any product and no mask will help with hair damaged from bleaching, only the hair salon can help there!

Very good product, using the entire therapiste range I saw a tremendous change in my hair. Even on its own, though, it does a very good job on the hair.

After 4-5 uses, it no longer dispenses cream, only gel, and it doesn't do its job well. It's much better to buy the oil

I have very damaged hair from bleaching. It's a waste of money unfortunately. The hair is tangled and difficult to comb. I tried using a lot of product as the description says. Nothing! Note that I also have the shampoo, conditioner, and mask! I'm telling you, you're wasting 100€ for nothing. It's terrible and I wonder how it can have good reviews.

The product simply doesn't exist!! Amazing, it doesn't damage my hair with the straightening iron even though I have fine hair. It smells wonderful, helps with frizz, and leaves the hair very soft!
I buy it constantly.

In my own damaged and brittle hair from bleaching, plus the fact that I have a lot of hair, it didn't offer anything special and it also finished very quickly. It had a very nice scent.

Incredible product! It gives "body" to the ends and shine to the hair. It has a nice subtle scent. It is a bit expensive for the quantity it has (15+15ml) but it's worth it! I have long hair, about halfway down my back, and one or two pumps are enough!

Terrible product and I'm sorry because I trust Kerastase blindly with other products. Firstly, the quantity is minimal inside the packaging - it barely lasted for 5 to 6 uses - considering that I have long and dry hair at the ends, it doesn't offer anything special in terms of hydration, I didn't see any improvement in the scissors and the most important thing is that it is extremely expensive for what it offers! Choose a leave-in cream from the market, it will be better.

Amazing product! I thought it would be heavy for my fine and oily hair, but I was wrong... It moisturizes and straightens the hair deeply!

Amazing product!! Packaging ⭐⭐⭐⭐⭐
Fragrance? ⭐⭐⭐⭐⭐
Effectiveness? ⭐⭐⭐⭐⭐
Leaves hair shiny, after application there is no chance of split ends.. no matter how much you pull.
The comb glides incredibly even on my most difficult hair. Fine hair with damaged ends full of knots.
Works better on dry hair.. meaning after a little blow-drying, you feel better in your hand the application.. how much and where you will put it.
Luxury packaging.. and the fragrance is a dream!!

After a decapage that left me with some burnt ends, I bought it for the second time and I wasn't disappointed! After 2-3 washes and applying the serum on damp hair, my ends are moisturized and healthy! Amazing product, it does what it promises!

I would give it another 5 stars and more.... I have been using it since November '18... I have dry, colored hair (as usual for blondes..) that is also damaged and especially at the ends... I see a huge difference in the "scissors", I use it every time after washing my hair... and it also has a very nice scent..!! Also, while I bought a second identical product for backup, the first one is still not finished (I use 2 sprays each time, wash my hair about 2 times a week, *hair length up to the shoulder). So it definitely worth its money, as it lasts for several months.

I recommend it! I have curly hair that tends to frizz. Personally, I first dry my hair and then apply a small amount to each section. Then I straighten it with a flat iron. The hair becomes smooth and silky. I have curly hair that tends to frizz and is damaged from bleaching. I recommend it because it gives me the ability to control my hair!

It is a very good product and expensive. It is not worth it. When you have long or thick hair, you need it every month. Who pays 55-60 euros just for a serum? Ridiculous

Very good product compared to others on the market that simply soften the hair, this one nourishes and hydrates the hair deeply, giving it shine and providing protection from heat, so it's really worth its price. Personally, I have thick and damaged hair due to recent bleaching, and I noticed a difference from the first use. However, be careful as you only need a small amount and apply it only to the ends, as it has a creamy texture mixed with oil. The scent is irresistible!