In electrology, what technique is primarily used to permanently remove hair?

Electrolysis is the technique primarily used for permanent hair removal in electrology. It involves the use of an electric current delivered through a fine probe inserted into the hair follicle. This current destroys the hair follicle, preventing future hair growth in that area. The FDA has designated electrolysis as the only method for permanent hair removal, making it distinct from other hair removal methods like laser therapy, waxing, or shaving, which do not provide permanent results.

Laser therapy is effective for hair reduction but may not achieve the same level of permanence as electrolysis, as some hair follicles can regenerate over time. Waxing is a form of temporary hair removal that pulls hair from the root but does not prevent future growth, and shaving simply cuts hair at the skin's surface, allowing it to regrow quickly. Therefore, electrolysis stands out as the only permanent method for hair removal, which is why it is the correct answer.