3 years. Oleaginous leaves are the leaves of the Euphorbiaceae plant oil citrus, is the efficacy of outstanding Chinese herbal medicine, with this leaf as a pillow gong need to pay attention to keep the tea pillow dry in the process of use, it can be used for 3 years, in which the effect is to clear away heat and detoxify the toxins, promote dampness and eliminate swellings, and the role is the main treatment of skin eczema.