Kérastase hair styling products. DERMO-CALM Sérum Sensi-Dote. Soothing serum for sensitive scalp. Enriched with mint, provides a lasting and pleasant sensation of freshness and cleanliness. Fights itching, redness and irritation, relieving the most damaged areas. Apply two pipettes of serum over the scalp into recently washed damp hair. Then massage with the fingertips to stimulate blood circulation and the absorption of the product. Don't rinse. Use it up to three times a week.