Seriously, it may also lead to hair follicle atrophy and hair loss. Some hair dyes may also penetrate into the skin, thus damaging the kidneys and liver and threatening health.
People who dye their hair are afraid that black hair will grow out and affect the aesthetic feeling of the overall shape. So in reality, many people dye their hair once a month, and this frequency is not recommended.
Extended data:
Four types of women should not dye their hair.
1, long-term open-air operator?
If the hair is often exposed to strong sunlight after dyeing, the ultraviolet rays in the sunlight can easily damage the hair, making it dry and easy to break. If it is cold outside, it will also make the scalp blood vessels in a state of contraction, so that the hair can not get sufficient nutrition and affect growth.
2. Women during pregnancy and within six months after delivery?
During this period, women's physiological state, including endocrine, has changed, and their hair is fragile and easy to fall off. After dyeing, their hair is damaged again, and a lot of hair will be lost.
3. Patients within 2 months after getting infectious diseases?
At this time, the patient's general health condition is not only poor, but also the hair is at a low nutritional level, and the hair is dry, and it is easier to fall off after dyeing.
References:
People's Network-Is hair dyeing harmful? How many times a year do you dye your hair?
References:
People's Network-Is hair dyeing harmful to human body? These four types of women should not dye their hair.