Opalescence 35% CP Mint - Gel Syringes Teeth Whitening - Refill Kit (2 Packs / 4 Syringes Total) Carbamide Peroxide Gel. Made by Ultradent. Tooth Whitening Refill Syringes 5197-2

I smoked right after and no sensitivity first time using it in a tray as well. This100% did lighten my teeth, I recommend there tooth paste the sensitivity one. Also watch out for gum burns I did on accident but the pain was only like a annoying 5-6

These are Terrific, at 35% and a good buy. My sister is a dental hygenist and she told me about these online at Amazon. Better whitening and better price than at my dentist office that only offers 10% whitening @$40 for 2 :-(... I recommend.

I used Opalescence years ago as a Dental Assistant before we could buy online and it was my favorite. I tried this for only 15 minutes to check sensitivity and it honestly whitened at least one shade with no sensitivity. Oh the glory of carbamide peroxide!*Please note*You only need one tiny drop in each facial side of your trays in the tooth-groove. It will liquify and surround the surface of teeth. If you use too much, you run the risk of getting on the gum surface and it will cause irritation. Start slowly if you have sensitivity. This stuff is awesome

oh my god this stuff works miracles! i am a vape user as well as a coffee drinker and after three 30min sessions (once a day for 3 days) i have pearly whites again! the results were visible after just the 1st sessionit is very strong and the reviews about it burning your gums are very true, i read someone say they applied it with a q-tip avoiding the gums and it works great :)

Works well! It’s super strong and burnt my gums, it hurt and turned them white which was scary! I came up with the idea to put the gel on a q-tip, put it on my teeth and then I insert the retainer that way it never touches my gums, works perfectly!

I use these in a dental tray make by the dentist. My teeth are so white from this whitener. I use it as needed after my initial whitening use. Great buy and worth the money.

Works very well but beware it may leave your teeth extremely sensitive. I have ordered this again because I am very pleased with the end results.

This stuff is amazing but don’t expect immediate results. The chemical reaction takes 2-6 hours to develop and is not sped up by UV. This is a gentler alternative to pure peroxide whiteners. That being said, it’s also extremely strong and may cause gum damage if not done properly. Invest in gingival barriers + UV light if you plan to do your own whitening. My teeth were extremely yellow and are drastically whiter after 2 syringes. I’ve never had teeth whiting done so i’m very impressed! Do not use this product unless you plan to use it correctly because it’s very strong!