Fundamental Filler Serum


Kérastase's fundamental Première Sérum Filler treatment is a leave-in serum for internal repair of all types of damaged hair, to reveal shiny and supple hair.

Treated hair, because it is very porous, absorbs three times more calcium from water than untreated hair. This excess calcium damages the hair visibly inside and outside the hair. Kérastase's fundamental Filler Serum treatment works in two ways: its light balm texture seals the cuticles to protect the hair surface while filling the fiber and strengthening the hair. Hair is protected from damage caused by calcium from hard water, as well as humidity and heat (up to 450°F). Frizz is eliminated and hair is left smooth, supple and easy to comb.

To take even better care of damaged or bleached hair, combine with other products from the Première range. ‌To optimize results, layer products: First apply Kérastase Ultra-Repairing Decalcifying Concentrate hair treatment to hair, do not rinse. Then apply Kérastase Restorative Decalcifying Bath Shampoo. Then use the conditioner or mask, and finish the restorative routine with the Kérastase fundamental Filler Serum treatment.

Patented technology**

72 hours frizz-free*

* Instrumental test
** 5 patents issued in Brazil and France

How to use it?

Apply to towel-dried hair. Do not rinse. Dry and style with heated tools.

To complete your routine

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