On the advantages and disadvantages of glycolic acid in the hair interval
Glycolic acid is common in skin care, but it is used in the hair and retained overnight. Its advantages and disadvantages are all present and cannot be ignored.

1. Benefits
1. ** Exfoliation **: Glycolic acid has the ability to exfoliate. It can gently exfoliate the old exfoliation accumulated at the mouth of the hair follicle and the surface of the hair, making the hair follicle smooth and the hair more clean. This process is like opening the door to new life for the hair, helping it to rejuvenate.
2. ** Promote absorption **: After exfoliation, the absorption capacity of the hair and scalp is enhanced. The nutrients such as conditioner and hair mask used in the follow-up are easier for the hair to ingest, just like the smooth flow of nutrients into the dry land, and the nourishing effect is doubled.
3. ** Improve the scalp environment **: Moderate glycolic acid can adjust the acid-base balance of the scalp, create an environment suitable for microbial survival, and inhibit the growth of harmful bacteria, just like building a stable ecological fortress to maintain scalp health.

2. Risk
1. ** Dry hair **: Glycolic acid or cause hair water loss, especially overnight retention. If the hair is in a dehydrated state for a long time, it will be like withered grass and trees, which are prone to dryness, fragility, and even split ends.
2. ** Scalp irritation **: The scalp is more sensitive than other parts of the body. The acidic nature of glycolic acid may cause uncomfortable symptoms such as tingling, itching, redness and swelling of the scalp in some people, like ripples on the surface of a calm lake, breaking the original calm of the scalp.
3. ** Hair damage **: Excessive use of glycolic acid or long-term retention in the hair may damage the stratum corneum structure of the hair. Once the stratum corneum is damaged, the hair seems to lose its strong armor, and its ability to resist external damage is weakened, such as susceptibility to ultraviolet rays, environmental pollution and other effects.

To sum up, leaving glycolic acid in the hair overnight may have benefits such as exfoliation and absorption, but it also comes with risks such as dry hair, scalp irritation and hair damage. Therefore, users should carefully evaluate their hair quality and scalp condition, and be cautious to avoid losing one or the other and damaging the hair.