Hygiene ball is mothballs. Mothballs contain some substances such as p-dichlorobenzene and naphthol. Benzene is a kind of toxic chemical material, which can be inhaled through human respiratory tract and absorbed through skin mucous membrane and digestive tract, and it can directly damage respiratory tract, liver, kidney and other organs after entering human body. It can also act directly on red blood cells when the rupture and acute hemolysis occurs. Normal adult body red blood cells have an enzyme that can quickly combine with volatile naphthol to form a non-toxic substance, which is excreted with urine. Therefore, the effect on the health of adults is not great. However, clothes that have been exposed to mothballs need to be sunbathed before wearing. Because the volatility of naphthol and p-dichlorobenzene is very strong, after sunlight, basically evaporate away, and then wear it again, the effect on the body is relatively not very big. However, mothballs have a greater impact on newborns, who are prone to lack of this enzyme or immature enzyme activity, naphthol is very easy to destroy red blood cells, leading to acute hemolysis. Symptoms such as severe jaundice can occur, and in serious cases, it can also be life-threatening or leave sequelae such as mental backwardness, motor and auditory nerve disorders. In addition, camphor pills contain p-dichlorobenzene which causes certain damage to the neurohematological system of young children. So for children, the younger they are, the greater the toxic effect of mothballs.