Hello! My name is Jessica, I am a physician assistant, and one of the providers at Aesthetic Skin in Winnetka and Chicago. This is a great question. To achieve optimal results with CO2 laser treatments, a minimum of three sessions is typically recommended. The number of treatments required can vary based on individual skin conditions, the severity of concerns being addressed, and specific treatment goals. The CO2 laser is highly effective for resurfacing the skin, addressing wrinkles, pigmentation, and overall texture. It works by removing the outer layers of the skin and stimulating collagen production in the deeper layers. While some improvement can be noticeable after a single session, multiple treatments are often necessary to achieve significant and lasting results. Each session builds on the previous one, allowing for gradual and controlled improvement. Typically, treatments are spaced several weeks to a few months apart to give the skin adequate time to heal and regenerate. This approach helps to ensure that the results are both effective and sustainable, with reduced risk of complications. I hope this helps and best of luck!