Laser tightening is non-invasive, non-surgical, and not very painful. Phew! Other than slight discomfort from the heat produced by lasers during the procedure, tightening your skin is practically painless. laser skin tightening works by using an infrared light laser to penetrate beneath the skin. The laser is hot — about the same temperature as a hot stone massage — and it heats up the collagen under the skin, causing the collagen to constrict and the skin to look firmer. 6 B