My Zenyum aligning treatment has been very smooth and customer service are great. The discomfort is minimal compared with other treatment options. It was mildly unpleasant in the first day but after several days of adaptation, you'll get used to it. I have broken a few aligners during the treatment but switching over to a new sets earlier doesn't really cause any issue. I'm currently close to finish, adjusting my biting issue but so far i have seen great improvement in my teeth alignment. So, for those who has doubts like I do in the beginning, you can really give it a shot and it will change your smile completely