盐水洗头防脱发，这是有科学根据的。因为人经过体力劳动就会出汗，而头部出汗往往比身上出汗多。当大量的汗水粘在头皮表层，就成为细菌理想的繁殖地。头皮一旦受到细菌感染，就会导致发根松动，容易出现脱发。要防止脱发，就要保持头部的清洁卫生，最好的方法就是用盐水洗头 Saline shampoo anti-hair loss, it is scientifically based. Because people will be sweaty after manual labor, and the head sweating tend to sweat more than the body. When a large amount of sweat sticks to the surface of the scalp, it becomes an ideal breeding ground for bacteria. Once the scalp is infected by bacteria, it can cause hair roots to loosen and become prone to hair loss. To prevent hair loss, we must keep the head clean, the best way is to wash with salt water