Opalescence 45% Syringes Teeth Whitening Gel - with PF - (4 Syringes) Refill Kit Carbamide Peroxide. Made by Ultradent, in Mint Flavor. Tooth Whitening 5359-2

I have sensitive teeth. For me using the strong for one or two days works better than using a low percent over a few weeks. I am a hygienist and the doctors always recommend the later techique, but I tell my patients to try what I do. Love this brand too!

As a hygienist, I love this brand! We sell it in our office but only the 35% and at a higher cost with less product. I tell all of my patients to buy it through Amazon for that reason. I never recommend the 45% unless it's a savvy patient. Stick with the 35% if your new to it.

I've used this product for years. Works greatHad always bought at dentist office, so I have the trays, last time I bought it there the price went to $50 for two tubes....this was 4 tubes for $40.57. The expiration date is Oct 2026 !

Been using this brand for YEARS... more than a decade at this point. I really love the efficacy of it, just don't get it on your gums, or, FIRE!

Best teeth whitening product ever. However use with extreme caution as it will BURN YOUR GUMS and cause hypersensitivity and bleeding if too much is used. I know this from experience after just 25 minutes! This brand I purchased was of 45% strength so you only need to apply one very small spot of gel in the tray mould of each tooth and once inserted will compact and possibly spread to your gums,so beware. With just one syringe my teeth have come up beautifully white like piano keys,but couldn’t brush my teeth for almost a week. Hard lesson learnt. However I would still recommend this product.

Well it definitely works. My teeth ate decently white to begin with but these really whitened them up. Me personally I like to feel a little pain so I know it actually works, so if you have sensitive teeth I wouldn't recommend.

Does a great whitening job. My teeth are whiter than my wife's for the 1st time ever.

These do lighten your teeth, but not like movie star white. I use them with fitted trays I got from dentist. They do cause teeth sensitivity though so wait a few days in between uses. I wanted something a little stronger because I got the 35% from my dentist and it wasn't lightening like I'd hoped. These whiten a little better I guess, but again not as much as I wanted. Might get better with more uses.