Zhang Chengyu's impression of face is a big factor, and hair is the key to looking better. However, many people are troubled by white hair and look much older than their actual age. Some people even start to have white hair when they are young, so they feel deeply distressed. It turns out that white hair is not necessarily a natural phenomenon of aging. Japanese anti-aging professional doctors pointed out that sunlight may also be one of the reasons! Expert: Face should be set off by hair. Improving white hair can make face look better. Tamura, a Japanese hair diagnosis expert and hair consultant, said that about 70% of people's impressions of faces are determined by hair, which largely determines the first impression, so improving white hair will also help to turn over the impressions of others. If the scalp is irradiated by ultraviolet rays, permed or dyed, or affected by factors such as stress, partial eclipse, lack of sleep, and poor blood flow in the shoulders, it may passivate the operation of cells that maintain healthy black hair, which may easily cause problems such as white hair, sparse hair, and hair loss. Akishi Sawada, a plastic surgeon and anti-aging medical professional at Tokyo Police Hospital in Japan, also said that recent research pointed out that one of the reasons for the increase in white hair may be that the scalp is exposed to ultraviolet rays. Sun protection should also be done indoors in winter to protect the scalp from ultraviolet rays. In this regard, Tamura Chennai suggested the following preventive measures: it is not appropriate to wash your hair in the morning and wash it at night. Tamura Chennai pointed out that shampooing in the morning will wash away the sebum that protects the scalp. If you are exposed to ultraviolet rays again, the cells in your scalp will be more easily damaged. On the contrary, shampooing at night can make scalp blood flow better and remove dirt in pores, but it will have a hair care effect. Anti-ultraviolet Tamura Chennai stressed that in fact, it is the scalp, not the face, that is the easiest to get sunlight. The scalp will probably be exposed to more than twice the ultraviolet rays on the face, so protecting the scalp is even more important than sun protection on the skin. It is recommended to wear a hat and spray with ultraviolet rays to prevent the scalp from being sunburned. Akishi Sawada believes that ultraviolet A waves (UV-A) will penetrate deep into the skin, causing skin aging and spots. Not only that, A wave is easier to penetrate the ozone layer, and it is easier to irradiate the ground than B wave, and it also penetrates clouds and glass, making the room vulnerable to A wave. Therefore, even indoors in winter, it is best to take sunscreen measures such as applying sunscreen lotion and wearing a hat as much as possible.