This does work well. I use to use the same product, but it was the overnight formula, which I liked being able to get the whitening effect for the entire night, where as this new formula is only for 1hr. Not sure if it is more potent, or why this has changed, but it works regardless. They also changed the tube from a metered push button with click, (which fails easier) to a simple dip in brush. I drink a lot of coffee and I do smoke, this whitener does make a noticeable difference in shade/color on the very 1st use. My teeth are somewhat sensitive, and there has never been any negative effect on my teeth using this. I recommend it, as well as this seller that shipped fast. Read more

Noticed a very slight improvement, but no mind-blowing before/after contrast. The serum container needs to be transparent so you can see the serum level remaining. Even when giving serum time to dry on teeth still it seems to get on lips unless you hold your lips away from teeth with a finger for an hour. The strips which I've used in the past were way more effective than this brush-on product Read more

It definitely works. Noticeable improvement in 1-2 days. It's not perfect, and it's not cheap but it does make an improvement. I think it is too expensive for the amount of usable product you get. I would consider getting it again since it did make a noticeable improvement. It will burn your lips if you touch them while applying. I did this every time. It wasn't bad for me. Not a bad burn at all, just a few seconds of discomfort. Read more

I recently tried the Colgate Optic White Express Teeth Whitening Pen, and here’s my honest take. The pen is easy to use and has a convenient applicator that makes it simple to apply directly to the teeth. I noticed some whitening effects after just a day of use, which was impressive. After using it for the full 7-day treatment, my teeth appeared noticeably brighter, though not dramatically white. One thing I liked is that it’s enamel-safe, and I didn’t experience any sensitivity, which is a big plus. The gel has a mild taste and doesn’t leave any aftertaste. However, the whitening results weren’t as dramatic as professional treatments, but it’s a solid, affordable option for anyone looking for a subtle improvement in their smile. Overall, it’s a great product for those seeking gradual whitening without irritation. Would recommend it for light stains or a slight brightness boost. Read more

I recently tried the Colgate Optic White Express Teeth Whitening Pen, and I have to say, I’m impressed. Whitening products can be hit-or-miss, but this one genuinely delivered. The first thing I noticed is how easy it is to use. You just dry your teeth, apply the gel with the pen’s precise applicator, wait for an hour, and then brush off with water. I’m usually skeptical about “quick results” claims, but after the first use, I could see a subtle difference. Another big plus for me was the lack of sensitivity. I’ve tried other whitening products that left my teeth feeling sore, but with this pen, I didn’t experience any discomfort. It’s also enamel-safe, which was reassuring. I love that it’s small enough to throw in a bag if you’re traveling or out and about. I don’t need to worry about trays, strips, or extra steps. For anyone looking for a convenient and effective whitening option, this pen is worth trying. It’s easy, it works, and it doesn’t leave you dealing with any of the typical downsides! Read more