Washing your hair every day is bad for your hair and scalp. Frequent shampooing will remove natural oil from hair and scalp and make it dry. Generally speaking, it is more appropriate to wash your hair once every 3-4 days. This has the following scientific basis:

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1. The scalp itself secretes oil and salt to protect hair and scalp. Frequent shampooing will remove these natural protective substances, resulting in dry scalp and hair damage.

2. The oil glands on the scalp need time to resume secretion. Too frequent shampooing will lead to disorder of oil secretion, which will aggravate dandruff and dry hair in the long run.

3. People's skin including scalp will naturally fall off. Frequent shampooing will speed up the skin shedding, excessively stimulate the scalp and cause sensitivity.

4. Active ingredients need to stay on scalp and hair for a certain period of time to play a role. Frequent shampooing will reduce the absorption of active ingredients and affect the hair care effect.

5. Excessive shampooing will also aggravate the water loss of the scalp, because water is also an important nutrient for the scalp and hair, and frequent loss will cause the scalp to become drier.

To sum up, it is more scientific to wash your hair every 3-4 days. This can not only protect the natural barrier of hair and scalp, but also make all kinds of nursing ingredients be well absorbed, promote hair health, and avoid various problems caused by too many frequent shampoos. Of course, if the scalp is oily or dandruff is serious, you can appropriately increase the number of shampoos, but it is not recommended to wash your hair every day.

I hope that through the explanation in Chinese, you can better understand the influence of daily shampoo on hair and scalp, as well as the relatively scientific frequency and reasons of shampoo. If there is anything unclear, please feel free to ask questions, and I will answer them in further detail.