Bests & Worsts Reviews from Amazon

Works well after you spend a half hour searching the internet for instructions. The gel pens require quite a bit of twisting to first get them to put out the gel, just take it slow so you don't over twist when it finally starts coming out. Once you figure that out the gel goes on easy. The only thing that would make it better was if they had a gel pen where the brush was on a 45-degree angle for teeth further back. The mouthpiece is comfortable and not bulky while in use. There is a small notch on the inside top so that your top front teeth will hold the guard snug. The cord is a bit awkward with the 3 cord split at the end; I wish it was a single USB cord with converter attachments. There is also only an iPhone, micro USB, and a regular USB plug. It does not have the modern USB-C for newer Android devices. If you happen to have a portable battery charger you can plug it into that and it works great though. I haven't used it enough to give a review on product effectiveness, but I will report back. I'm upgrading this to 5 stars. This does in fact whiten teeth very well. If I quit coffee for a month I bet it would work even better. I went from a 6 to a 3 (1 being the best) on the whitening scale after a month of use, roughly every other day. Worth every penny.