Trial and error and time needed
These definitely work but are going to take some time and a lot of trial and error.  I have been using it for a week and the sensitivity is not as bad as I expected. My teeth are also noticeably whiter now. I often do my bottom teeth first because saliva makes it much harder to grip the teeth and I find that the upper teeth are above it all. Once applied, they stick very well and I needed to apply a little extra force to gently remove them.<br /><br />The first time I used it, I did notice some white stains but the instructions said they were normal and they did disappear after an hour. I was afraid to keep it on for the full 2 hours so I only did 1 and there was no sensitivity. My teeth felt very clean and I did notice some areas were brighter than others. I recommend avoiding coffee for a bit as it becomes very noticeable when you do drink it.<br /><br />I like this product and I think the duration needed and the unavoidable mess are worth it.
Rating: 4 stars