Definetly Works [SEP] This system definitely works to whiten teeth. Everyone's teeth are different and I imagine everyone gets very different results but it isn't snake oil - it does do something! I have very sensitive teeth and have steered clear of whitening for years. During the pandemic I've found myself drinking a lot more tea and that has really discolored my teeth and was starting to get embarrassed about them. I bought this device since so many people say it's good for people with sensitivity.<br />I used the device as instructed. It never bothered my teeth at all. It did start to irritate my gums a little, but nothing too bad and only while I was actually doing the whitening. What I did find, is that I was incapable of keeping my tongue completely away from the whitening product (especially because there's a lot of saliva build up and spitting involved). It really hurt the tip and side of my tongue on the days I was using it. I had to stay away from certain foods which was a bummer. After the recommended 5 days of use, my teeth were absolutely whiter. I didn't have Hollywood level whiteness, but they were a lot better than they had been and I was no longer embarrassed. I could have gone on and done more whitening, but my tongue couldn't take it anymore. I will probably go back in a couple of months and do the process again.<br /><br />I feel like I can definitely recommend this to people with sensitive teeth. I think everyone's whitening level will be different (some might be more or less than me) but it does work and depending on your level of tolerance for the whitening product, you can likely get to your desired level.