Really. Leave-in hair smoothing essence is a hair care product. Its main ingredients are to help nourish the hair. Just like applying hand cream on your hands, just spread the hand cream. According to the relevant information, the leave-in hair smoothing essence is real. Leave-in hair smoothing essence can form a protective film on the hair, thereby reducing damage to the hair from the external environment, such as when using hair gel, hair wax and other hair-fixing products.