As most people would be, I was sceptical at first. After thinking about it and looking at numerous reviews I decided to give it a go. I was onto my 3rd set of aligners and my brother, whom I hadn't seen in months, commented and said he could notice a change already. Now onto the retainers I am very happy with the outcome. My only advice is to ensure impression is done properly (top then bottom, not at the same time) and just be persistent with it. Its less than a year a wearing them full time and the outcome is huge. I would highly recommend to anybody who has even thought of the idea of trying it.