There are no harmful radiations that are emitted from the equipment; thus, it has no side-effects. Laser therapy is also. Think of reaping benefits from time exposed to red light like a bell curve, there's a fine balance between enough and too much. . . laser therapy is non-toxic, non-invasive and in over one million individual treatments, no significant adverse effects have been noted. . The study. As the name suggests, C02 laser facial resurfacing employs laser technology to smooth the face and provide a balanced, even texture to the skin. . . Permanent skin lightening laser procedures are relatively free of side effects.