Colgate Max 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

After just 3 nights using it, i can see a very subtle difference so I am already very happy. I used to smoke for 20 years then switched to vaping, so my teeth were unfortunately a bit yellow. I'm glad i bought this so I can have the confidence to smile more. If I can see a difference after 3 days then I look forward to how it looks after 30. You have to make sure you dry your teeth after brushing, then apply the serum, then make sure it dries. Don't put too much on because it'll get onto your gums and can irritate them.

Takes a lot of separate applications to make a little difference. I did a comparison by doing just my top set of teeth only so could do a direct comparison with the bottom, untreated set of teeth - to see if it actually works. Yes, but very subtle, but then again, the advert pic - before and after - is not a dramatic difference anyway.: and that is the level of shade difference I saw on my teeth. Application wise - the gel is clear, so cannot see if missing bits when applying it - and also, will be difficult to see when it has actually run out, as cannot see if there is any on the brush - I am still using mine after a couple of weeks and it could be that there is nothing left and i am just using the brush against my teeth with nothing on it! So will just have to decide on a day to stop, Would be better if the gel was coloured, as you are using it overnight in bed, so would not really be an issue with a coloured gel.

I've been using this for 3 months now, over time I would say it has lifted my teeth 4 shades,you have to.be persistent and use it every night. Its not an overnight fix.my teeth were always white due to the menopause they discoloured slightly. I think this product its the best I've tried .

I swear by this! No taste to it, I use it with the LED light and you can really see a difference in colour after use, dries down quickly works so well

Been using it for a few days but im struggling to have the motivation to continue as it appears to be doing nothing at all. The solution is crystal clear when applied so you cant see where its been applied or how thick it's gone on, tinting the solution would have really help the application process (you wear it overnight afterall). There are no instructions on the box other than "apply to teeth" so you're left in the dark about how much to apply and when to redip the brush, I've only just seen the listing here states one dip for 5 teeth (I was doing 1 dip for 2). I'm assuming its classed as enamel safe because its actually a very weak whitening solution. If it gets on your lips it'll dry as a white patch and you won't be able to remove it easily, it'll look like a permanent toothpaste tide mark. There's definatly some gum irritation on the bottom teeth as gravity pulls the solution down and it pools along the gum line buts its easily picked off. It's just a bad product all round and I wouldn't recommend it.

Awful. Should not be sold. Not only does it not work it’s awful full stop. Colgate has failed. And wasted money as didn’t use straight away and then gave it a few goes to say the least. Don’t waste your money as across the board bad reviews

Spot on

Works surprisingly well Great for the odd darker tooth but is also amazing for overall use A but hard to brush off but easily pick off with nails + I have sensitive gums and this did NOT harm them at all

It is not working