Mask New Gliss Serum DeepRepair, with the Amino-Protein-Serum formula it contains, penetrates deeply into the hair, starting from the deepest layers of the hair, to completely restructure dull and damaged hair in just 1 week*. As a result, the hair becomes silky soft and noticeably elastic. Thanks to its new formula strengthened with KERATIN SERUM, it repairs the damage that has occurred in your hair and protects it against damage that may occur in the future. Usage: Take the product in your palm, apply it to previously washed and rinsed hair by massaging it and wait for 2-3 minutes. Rinse with plenty of water! Use 2-3 times a week.