ColgateMax White Overnight Teeth Whitening Serum - Home Teeth Whitening Pen - Reverses 15 Years of Stains* While You Sleep - New and Improved Applicator - Enamel-Safe - Easy to Use

Absolutely fantastic. I was concerned that it would leave my upper left and right front teeth crowns (the Bugs Bunny teeth😃) but 1 application removed everything, including making those two white as well.All of them looked a natural white, not a Hollywood "Brilliant white wood gloss paint" type. Will happily get again if needed.Only one slight irritant is that if you get ANY on your lips, it's like removing super glue lol

Unfortunately didn't work well for me. I'd say value for money and size would be good if it worked but the quality of the product seemed very cheap and didn't work. It turned all stringy and didn't stick to my teeth well, not sure if that's because I applied it wrong but me and my partner tried multiple ways and it didn't work. Seemed easy to use and looked nice, but wouldn't rebuy. I'd imagine the whitening effect would be good with me using the colgate toothpaste with the same design. Size seems reasonable for the price.

Does whiten teeth with regular consistent usage but after you stop using it the teeth do darken a little pretty much straight away but not as dark as start. Went to an a2 colour but couldn’t really get it lighter with this.

Complete waste of money. The serum gunges up as soon as it is applied to the teeth and becomes stringy with no visible signs of whitening of the teeth. Brushing the teeth does not remove all the gunge either, you have to scrape it off. Terrible product.

Really effective. I was surprised at how easy it is to use. No waiting around. Excellent

The idea is good, but the execution is not good enough. On the tope teeth it will flows down and dries that way and sometimes it whitens the edge of your teeth. On the bottom it also flows down and it gathers at the root of your teeth making hard bits that are weird in the mount. Probably it can be applied a better way maybe putting less on the teeth but then its so tiny amount that its impossible to have any effect. Too much effort for unwanted side effects and nearly no results.

Brilliant, really does work amazing.

This product is not as a dream solution as most might think it is. The application is pretty annoying but it'll do. One of my complaints is that during the process, I would wake up with extremely white spots on my teeth, however this was not my teeth getting white but just the cristalized cerum on my teeth, which I could only remove by picking at it with my nails. If I'm being honest, Im not sure it's worth your money.