Depilatories have both positive and negative effects, even when used in the exact manner as directed. Typically, chemically depilatories are heralded as pain-free hair removal methods (versus, for example, waxing). Depilatories can also be utilized in the home by anyone as they do not require any advance training before application. They usually work quickly, and are easily available at various retail locations. Depilatory products also generally give different levels of strength as it applies to the hair removal process. Negative connotations of depilatory usage include an unpleasant odor, as well as messy applications of the depilatory substance. Though billed as “painless”, depilatories may irritate the skin, and their effectiveness is short-lived. The unwanted hair typically begins to grow again within two to five days time. Users with dark hair may also noticed “shadows” under the skin where they have use the depilatory, as depilatories only help in removing the part of the hair follicle that is above the epidermis.