This teeth whitening kit really works! I have used whitening strips several different brands and another whitening system using light, and I have tried whitening gel pens by themselves without light and while these other options did show some improvement in the color of my teeth this teeth whitening kit has done more by far. Compared to the other kit, this one takes half of the time, the mouthpiece fits much better and the gel pens last a lot longer. I have not experienced any discomfort from using the system. The lightning pens need to stay refrigerated and they have a shelf life of 12 months. I can't imagine using any other system after I have experienced this one because it removes the stains from smoking and drinking coffee better than anything else I've tried.I had a Wedding in 2 weeks to be in and was trying to make my teeth a little whiter for pictures. I loved that they sent a color chart, because I thought my teeth were pretty yellow, but according to the chart I was a 2. I’m also a procrastinator and waited until the week before the wedding to start whitening my teeth, and didn’t think anything would happen. To my surprise my teeth were actually past level 2 to level 1. They aren’t the Ross smile and shine bright white, but they are actually white instead of a hint of yellow. I would 110% recommend this product. It’s easy to apply the brush on gel and mouth piece. AMAZING product!!!Obvious improvement right after using the first few times. Plenty of product to last several weeks. Keeping the teeth guard in the mouth for 20 minutes/10 minutes (30 minutes total) a little challenging with salivating, but find something to read or watch or listen to, and the time goes buy fast. Needs to be recharged at least every other time, but each time is best before it loses charge. It will just shut off with a red light if there is not enough charge. I've used just the gel pens alone before, but this product is stronger as it keeps it on the teeth for a longer period of time with the mouthpiece. There was also no bad taste or effect during or after using. I had definite stains from coffee use, but this product has worked already to reduce the stains and I'm still using it and will see even more improvement. Can't lose at the affordable price!I admit, I was skeptical, but decided to trust excellent reviews. When I tried it for the first time last night it was absolutely amazing. When the 15 minute timer on the light shut off. I rinsed my mouth, looked in the mirror and...........whiter than they were 15 minutes ago. It is super easy to use with the brush/ pen for applying the product to your teeth, light unit goes in your mouth, turn on the light. Done. 15 minutes later teeth are whiter.Quality product for sure. Thank you!My boyfriend and I love this teeth whitening kit! It was very easy to apply and the results are noticeable after the second use. There is more than enough product. The only con and this is with any whitener is that it produces a lot of drool when applying, so you have to work quick to ensure it stays on your teeth.This tooth whitening gel works very well, especially with the enhancing lights, and the best part is that it’s non-irritating, which I’ve had a lot of problems with in the past with other whitening products. I also really like that there is a brush for applying the gel directly to the teeth instead of just putting it in a tray and letting it squish all over your teeth and gums. It only took me a few days to whiten my teeth to a great shade of white that I was happy with. The only thing to keep in mind is that the device does need to be charged via a USB cable every few uses.I had a snow Teeth Whitening kit for a bit over a year. It worked great, but after it broke a little over a year later, I decided to try something a bit cheaper. I found this on amazon with great reviews and figured I'd give it a try. IT WORKS JUST AS GOOD IF NOT BETTER!!!! And the best part is it's a small fraction of the cost for the kit and the extra teeth whitening gel. I wish I had gotten this in the first place. I would recommend to ANYONE looking for a professional teeth whitening kit!This is my first teeth whitening system. Due to my age and coffee intake, the stains are starting to show. I noticed whitening from the first application. I used tissue in my mouth to help while I applied the gel to my teeth. For stubborn stains this is essential. Apply the gel directly to the teeth for best results not just the tray. High quality and easy to use. I have sensitive teeth so I used it three days in a row and then took a break for a couple days and then three days again. My teeth are much improved after just two weeks of use.