Dandruff is a product of head skin metabolism, and adolescents are prone to dandruff because of the increase in androgen secretion due to high metabolism. When there is too much dandruff, it can be prevented and treated from the following aspects: 1. pay attention to scalp hygiene, often wash hair with warm water once a week, or once every 3-4 days if necessary, it is not advisable to use alkaline soap when washing hair, alkaline soap will stimulate the keratinization of the epithelial cells of the scalp to produce dandruff, you can use sulfur soap or shampoo to wash hair; 2. comb your hair frequently, comb your hair 2-3 times a day in the morning and evening to Promote the blood circulation of the scalp to increase the nutrition of the scalp, which is conducive to hair growth and reduce the keratinization of the epithelial cells of the scalp; 3, we should quit smoking, drink less alcohol, avoid eating spicy and fatty food, avoid violent scratching and scraping with sharp objects when itching, and treat with drugs if necessary; 4, Chinese medicine treatment is mostly based on the identification of lung and stomach damp heat, and the use of traditional Chinese medicine tonics to regulate endocrine secretion, reduce oil secretion and lower androgens.