The insertion of a single needle into a hair follicle for hair removal is known as what?

The correct answer refers to thermolysis, which is a method used in electrolysis for hair removal. In thermolysis, a single fine needle is inserted into the hair follicle where it delivers a high-frequency electrical current. This current generates heat, which destroys the hair's ability to grow by targeting the hair follicle's tissue. The process is effective for permanent hair removal and is often favored for its speed and efficiency compared to other methods.

This method is distinct from laser, waxing, and shaving, which do not involve the insertion of a needle or the destruction of the hair follicle at a cellular level. Laser hair removal involves the use of light energy to target the pigment in the hair, while waxing involves physically pulling hair out from the root, and shaving simply cuts hair at the skin's surface. None of these techniques utilize the precise and targeted approach of thermolysis that focuses on the individual hair follicle through needle insertion.