Kérastase Première Duo Discovery Set - Pre-Shampoo and Shampoo

This set is designed for severely damaged hair, including damage from bleaching, frequent heat styling, chemical treatments, and mineral buildup like calcium.

No, the ultra-repairing decalcifying concentrate is applied first to damp hair *before* you use the shampoo.

You should leave the ultra-repairing decalcifying concentrate on for 5 minutes.

Yes, this set is particularly beneficial for hair that has undergone chemical processes like coloring or bleaching, helping to repair associated damage.

Decalcification helps to remove excess calcium deposits that cause hair to feel stiff, look dull, and become fragile. This process restores softness and shine.

The concentrate targets and removes calcium buildup and begins internal repair. The shampoo then cleanses while continuing the repair process, reconnecting keratin bonds for stronger, more resilient hair.

This is a deep repair treatment. It is recommended to use it as needed based on your hair's damage level, often as part of a weekly or bi-weekly routine, potentially in conjunction with other Kérastase Première products.

Ensure the ultra-repairing concentrate was applied correctly before shampooing and left on for the full 5 minutes. Verify that both products were rinsed thoroughly. Consider incorporating a Kérastase Première mask for deeper conditioning.

Mineral buildup from hard water can sometimes interfere with product efficacy. Ensure thorough rinsing. If possible, use filtered or soft water for washing.

Discontinue use if irritation persists. Ensure the products are not coming into prolonged contact with the scalp. Perform a patch test if you have sensitive skin.