Most people have experienced a period of dandruff of one length or another. Dandruff is difficult to clean up and always seems to get rid of. At the recent Third Chinese Scalp Health Summit, experts pointed out that to reduce dandruff, the first step is to increase the frequency of shampooing and keep the scalp clean. The survey found that from 2003 onwards people’s shampooing frequency gradually increased in summer than winter, men than women (and shampooing the degree of difficulty). In China’s major cities, the average number of times a week people shampoo is 2 to 4 times, however, in the United States is more than 6 times. Increase the frequency of shampooing is mainly to get rid of dandruff and sebum already produced on the scalp, reduce sebum is equivalent to reduce the fungal nutrients, and then reduce its number, dandruff will naturally be reduced. Some people, especially women with long hair, worry that frequent shampooing will damage the scalp and hair. In fact, this concern is completely unnecessary. The shampoos we use today are very gentle and do not directly damage the scalp and hair. The real damage is caused by scratching the scalp when shampooing, drying the hair after shampooing, and using the hairdryer. The damage to scalp and hair caused by shampooing is less than one thousandth of that caused by perming and coloring. Experiments have proved that the sebum of the scalp is significantly reduced just after shampooing, but it can be restored to 60.8% after 3 hours, 82.1% after 6 hours, and back to its original condition after 24 hours. Therefore, in summer, especially for people with high sebaceous gland secretion, it is best to wash your hair once a day, so as to ensure that the scalp does not have too much sebum. In winter, when sebum secretion is relatively low, there is no need to wash your hair every day. In addition to increasing the frequency of shampooing, the real way to get rid of dandruff is to deal with Malassezia. Malassezia destroys our scalp by hydrolyzing the triglycerides in sebum into fatty acids and diesters. The latest discovery is that Malassezia is not only found on the surface of the hair, but also in the follicle funnel, a dead zone of cleansing. If anti-dandruff ingredients do not penetrate deep enough into the follicle funnel, they will not be able to get rid of Malassezia, resulting in recurring dandruff.