Because the laser is stimulating collagen and elastin synthesis within the skin structure, this is a holistic approach to solving common skin concerns. If you are correcting pigmented spots, the treatment is permanent but you must be careful about returning to the sun again. Wear SPF and appropriate sun protection to prevent the spots from returning. If you are correcting stretch marks, then these results are permanent as well provided that there is not a significant weight gain or loss to the area that might cause them to return