Opalescence 35% with PF Gel Syringes Teeth Whitening - (8 Syringes) Refill Kit Carbamide Peroxide. Made by Ultradent, in Melon Flavor. Tooth Whitening Refill Syringes 5404-4

Great product, really does a great job at whitening your teeth and the white lasts long just like treatment at a whitening center. Does make your gumline a lil tender so be careful not to let it sit on your gums. Overall glad I got it great product. Does it's job well

Love this product! Removes coffee stains! Just a heads up 45% will burn your gums. Stay 35% and below.

Works good but you definitely have to do more than one treatment. And if your teeth can stand it, try and keep them on for the entire hour.

Couldn’t really tell a difference. I didn’t really stick with it. But my younger sister tried it and her teeth look stunningly white. And she’s a smoker. I was shocked. They really do look stunning. We’re both in our 50’s.

Great stuff!!!

This item does whiten teeth is a short amount of time. My dentist made my trays a couple of years ago. Their products are expensive, but I found this whitener on Amazon. Works as well as the product directly from my dentist at a fraction of the cost. Highly recommended.

It does work somewhat as far as whitening but as soon as I put it on with my Invisalign there was a foaming crackling sound and it was super uncomfortable and I wanted to take off the retainer straight away but I barreled through. Taking it off 25 min later I see my gums are white, swollen, and irritated. Probably won't get this strength again !

Been using this Opalescence 35% gel twice a week overnight in my Invisalign trays and—wow—this stuff works. As a card-carrying coffee addict, my teeth were starting to look a little too espresso-forward, but now they’re gleaming like I’ve never touched a latte. That said, 35% is no joke. Leaving it on for 10–12 hours definitely brings the brightness, but also brings the zing—hello sensitive teeth and slightly angry gums for a couple days. It’s like my mouth goes through a bit of a whitening boot camp, but hey, no pain, no pearly gain? Melon flavor is... interesting. Not bad, just kind of a weird moment when your mouth tastes like fruit salad while your teeth are turning snow-white. Would I do it again? Yep. Already did. Just maybe not right before a big bowl of ice cream.

It came out clumped together and not in a smooth gel consistency or a watery consistency. I used it it kind of worked but won’t be trying it again. I think it maybe wasn’t stored properly before? Also it burns your gums sooo badly you have to be careful.