What is the Principle Behind Laser Hair Removal?

Laser hair removal is a commonly used cosmetic method. It utilizes high-energy lasers to damage hair roots, reducing or eliminating hair growth. So, what is the principle behind laser hair removal? The principle lies in the selective photothermolysis effect, where the laser is absorbed by melanin, converted into thermal energy, and then transmitted to the hair follicle, destroying the follicle cells and surrounding hair root tissues, ultimately achieving hair removal. Since melanin only exists in the brown pigment cells within hair follicles and roots, only these areas are affected by the laser, sparing the surrounding skin from harm.

During laser hair removal, the doctor uses a handheld laser device to direct laser beams onto the desired area. The laser beams penetrate the skin, damaging the melanocytes within hair follicles and roots. Subsequently, under the influence of thermal energy, the follicles and roots are destroyed or lose their growth capacity, resulting in hair removal. It's important to note that laser hair removal cannot completely eliminate hair in a single session due to the hair growth cycle; only hairs in the active growth phase can be fully destroyed by the laser. Therefore, multiple sessions are typically required to achieve the desired results.

The principle of laser hair removal, based on selective photothermolysis, ensures an effective and safe method for hair removal. However, prior to undergoing the procedure, it is crucial to make adequate preparations, such as assessing one's health status, selecting a reputable hospital and doctor, and following the doctor's advice and guidance to prevent potential adverse effects.