The Kerastase Touche Finale Polishing Serum was the most expensive hair serum I’ve ever bought. I paid 36$ for 30 ml. Before buying the product, I watched many of the Kerastase’s own hair tutorials and it seemed that the product makes wonders. I am writing this review after I used almost all of this product, so this is definitely not a first impression review. Also, I took this photo below after I finished the Kerastase serum and bought a new, Wella, serum. What does Kerastase Touche Finale Polishing Serum promise to do? On their website it sais that the product is: “A high-shine polishing serum that perfects all hair surfaces with touchable…