I had a course of 9 treatments for my stretch marks. They are maybe 20 years old now. That sounds like a lot of treatments, this is what I thought but my stretch marks are very big and deep. To be honest, I could have had more treatments but I thought they looked a lot better already and I am pleased with this improvement. I can wear short sleeves tops now. My daughter had hair removal on her nipples and under her arms and her hair has gone. we might all have different speeds of improvement, because even the stretch marks on my right arm cleared better than the left arm but I didnt feel any difference in the way the therapist treated them both. I think the clinic was good for us. They tried to help me without selling me a lie. The therapist are a mixture of english and foreign but both speak fluent english, I understood them. That is my two pence.