It was stressful because I had too much fat on my cheeks. I had a contour injection in the past and the effect was so good that I tried to get it again, but the price + bruising took a long time. Contour injections need to be done at least 3 times. So, after looking for it, I got the Accu Injection, which says the effect appears immediately. That's fine. It's not a dramatic change, but it's definitely effective. I thought it was because I heard that the effect was visible from the 3rd day onwards, but from the second day on, I noticed that my chin became slightly slimmer. As far as I can feel.. the effect lasts for up to a month, and after that, as long as you don't gain weight, it's maintained. It's been less than a week now, so I'll come back with an accurate review in a few more weeks.