Your hair will be burned and gone immediately. However, removing hair from an area completely takes a couple of sessions. Even more so if it’s from a large area, like the back or legs, other factors, like hair thickness and color, the type of laser, and skin color, also can affect the results, but overall, each treatment session will leave you with a 10 to 25 percent reduction in hair.

You’ll need about two to six sessions to fully remove the hair from any large area. Even if it regrows after a few months or years, there will be less of it, and it’ll be finer and lighter.