In order to prevent permanent hair growth, laser epilation involves absorbing a laser beam by the pigments that give hair its color, turning it into heat, then transporting this heat to the hair follicles and destroying the hair papilla.

The full elimination of the root is what matters most in laser epilation. Although the laser removes the hair from our skin visibly, it only has a superficial impact beneath the skin, allowing the hair to regrow from the same spot. This is because the laser light is not the right kind and the heat cannot penetrate deeply enough.

If the hair remains in place for at least six months after the permanent laser epilation, we may consider it a success (it can be up to 1 year depending on the region). Don't forget that there are significant differences between burning hair and completely removing the hair root. Failure is understandable after at least a year in many laser or IPL procedures when the hair root cannot be eliminated.