
The cuticle is the outer structure of the hair strand, which plays a role in protecting the internal structure of the hair strand. When the cuticle is damaged, problems such as frizz and split ends will occur. Frequent perming and dyeing, excessive cleaning, dry environment and other factors will damage the structure of the cuticle, leading to the loss of nutrients in the cortex, making the hair strands dry, fragile, and dull.