Preparation Before Hair Removal: Before using this product, if you have used other methods to remove hair before (such as epilation, depilatory cream, beeswax, etc.), you need to wait until the hair grows and recover before using this product. Before using this product, please make sure that the area to be depilated is shaved. Shaving the hair is necessary to ensure that the light energy is directed to the roots in the most efficient way. Remember not to use a depilatory cream before depilation. Clean the Skin: Please keep the skin clean and hairless, completely dry and free of oily substances (such as no cosmetic deodorant, lotion, perfume, suntan, sunscreen, etc.)