To prevent hair loss, we must first do the following, that is, scientifically care for hair. The methods are as follows: First, we must avoid excessive hair dyeing and hair exposure, otherwise the keratin, the main component of hair, will be damaged and the hair will easily fall off. Second, we should pay attention to a balanced diet. Excessive weight loss or partial eclipse will lead to malnutrition, leading to abnormal synthesis of some pigments and the most basic protein in hair, which will make hair fall off easily and make hair unhealthy. Third, pay attention to washing your hair correctly. Don't use force when washing your hair, otherwise it will fall off. Choose a shampoo product that suits you. Choose oily hair with refreshing oil control to nourish dry hair. Don't use a comb immediately after washing, it is best to dry it naturally, and then use a wide tooth comb to avoid excessive pulling and hair loss. Fourth, girls should not tie their hair too tightly, which will also lead to traction alopecia. Fifth, it is necessary to have a regular schedule and a light diet, otherwise it will lead to exuberant scalp sebum overflow and sudden memory dermatitis. These are some common sense of hair care. Secondly, it is necessary to clarify the nature of hair loss, and choose different treatment schemes according to the different nature of hair loss, such as male androgenetic hair loss. In addition to general maintenance, finasteride should be taken orally and minoxidil should be used externally to fundamentally control hair loss.