What are the three types of permanent hair removal methods?

The three types of permanent hair removal methods are electrolysis, laser hair removal, and photo-epilation.

Electrolysis is a method that uses an electric current to destroy the hair follicle, effectively preventing future hair growth. It is the only FDA-approved method for permanent hair removal and works on all skin types and hair colors.

Laser hair removal involves the use of concentrated light beams to target and damage the hair follicles, which delays hair regrowth. This method is effective and offers a significant reduction in hair growth over time, although it may require multiple sessions for optimal results.

Photo-epilation utilizes intense pulsed light (IPL) technology to achieve hair removal. Similar to laser hair removal, it targets the pigment in hair, leading to the destruction of the follicle. This technique also requires ongoing treatments to maintain results.

The methods listed in the other options, such as shaving, waxing, and threading, are temporary hair removal techniques that do not provide lasting effects since they only remove hair at or above the skin's surface without affecting the follicle itself.