Dry and frizzy hair may be due to malnutrition, excessive cleansing, excessive perming and coloring, and can be improved by strengthening care as well as medication. 1. Malnutrition: Hair growth needs nutrition, if malnutrition will affect the normal growth of hair, dry and frizzy, you should strengthen the nutrition, eat more high-quality protein, supplement copper, iron and other trace elements. 2. Excessive cleaning: excessive cleaning will destroy the phospholipid layer of the hair, resulting in the loss of nutrients, which leads to dry hair withered, this situation should be moderate to reduce the number of times to clean the hair, choose to nourish the shampoo. 3. excessive perming and dyeing: frequent perming and dyeing of the hair, chemical substances will cause damage to the hair, dry and frizzy, should avoid perming and dyeing of the hair, to choose a mild shampoo products. There may be other reasons for dry and frizzy hair, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment. The above medications should be used in accordance with medical advice.