Optimistic オプティミスティック ファストスリークヘアセラム 100ml/260ml リフィル

This hair serum uses acid and heat to straighten curly hair, improving smoothness and reducing frizz. It also repairs damage and is suitable for colored and bleached hair.

• The description claims that using this product twice to three times a week can promote internal structural changes in the hair, leading to sustained smoothness.
• The description claims that it improves smoothness and reduces frizz.