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The anagen phase is the active growth stage of the hair cycle, during which the hair bulb is attached firmly to the dermal papilla. Because the root is strong and deep, waxing at this stage allows removal of the entire hair shaft, including the bulb, resulting in longer-lasting smoothness. The catagen phase (choice B) is a transitional stage where the follicle detaches from the papilla, making hair removal less effective. The telogen phase (choice C) is the resting stage, when the hair is loosely anchored and easily shed naturally; waxing at this stage often leaves behind other actively growing hairs. Exogen (choice D) is the shedding stage where hair naturally falls out, but it is less targeted for removal. Understanding hair growth cycles enables estheticians to schedule waxing appointments for clients optimally, improving results and reducing regrowth speed. Regular waxing can gradually synchronize hairs into similar cycles, enhancing overall efficacy. This knowledge also applies to other hair reduction modalities, such as laser and electrolysis, which rely heavily on targeting hairs in the anagen phase.