However, silicone oil may have certain potential safety hazards. Since silicone oil is insoluble in water, it is easy to form a film and wrap around the pores. There will be a certain amount of residue on the hair and scalp, so it can create a soft feeling. However, long-term use of shampoo containing silicone oil may cause the hair to lose elasticity, and the hair follicles will be blocked and unable to metabolize normally. If silicone oil is deposited on the hair, the hair will become oilier and oilier, the scalp will become itchy, and even the hair will continue to fall out. But in general, silicone oil is a macromolecular substance that is not easily absorbed by hair follicles. Therefore, the reasons why consumers sometimes experience clogged pores, oily scalp, itching, and even hair loss cannot be entirely attributed to silicone oil. Many times, it is due to personal inadequate cleaning, irregular life or eating habits, which lead to the accumulation of sebum and other oils, causing the growth of Malassezia and other bacteria, and may also cause redness and itching of the scalp. In addition, sebum, oil, etc. are exposed to the environment, especially in haze and other polluted weather conditions or under strong ultraviolet conditions, and peroxidation may also cause scalp inflammation. In addition, some allergenic fragrances, surfactants, anti-dandruff agents and some active ingredients contained in shampoo can also cause certain irritation or allergic reactions.