Stretch marks are some of the hardest things to remove. They are caused by collagen that has fractured and lost its supporting structure. Hence, why they look thin and indented. To remove them, you need to actually remove the skin, and grow new collagen underneath. See Smartxide Dot Therapy. It’s a fractionated CO2 laser that has shown some really great results for stretch marks. Expect it to take more than 3-4 treatments.