All White 22% Carbamide Peroxide,0.17 Fl Oz-3 Count(Pack of 1)

You'll need a whitening tray, but once you have that, this stuff works perfectly. It's not too harsh and whitens pretty effectively. I'm pleased with this purchase!

Love everything about this product. Been using for years. Works fast, good for sensitive teeth

Not only was the product expired as of 1/2012 (purchased 8/2013), but the plungers in the whitener syringes had popped out and spilled into the package! Amazon gave me a credit for the purchase so all good but I wouldn't buy this. Had bought this a long time ago and it did work to whiten teeth. Amazon must have a very old supply!

This is my 2nd purchase of Dr. Collin's and I really do believe it works. I had my teeth professionally whitened 10 years ago, complete with custom trays. My dentist told me that if I used my "trays" after each professional cleaning (3x per year) my teeth would pretty much remain at their current level. This is true, and for years I purchased my refill syringes through my dentist. I was hesitant to try another brand but did purchase Dr. Collins and am happy with the results. I do drink coffee and smoke cigarettes, which you would never guess. My routine is after my professional cleaning, I bleach for the next 3-4 days, twice a day for 60 minutes, and when I think I need a boost! Just don't overdo the bleach in your trays or trust me your gums will hurt terribly. This is trial and error, I would rather use a few extra days than suffer. Overall, I believe the product works as stated and the price is affordable.

I opened the product box to find leaking bleach gel throughout. The packaging did not protect the syringes or their plungers, and as a result two of the three syringes had lost gel: one had lost 2 of its 5 mls, the other 1 of its 5 mls. So, a total of 3/5 of the contents of a syringe was lost. This could have been prevented by having the syringes in a tray that prevented movement of the plungers.

I didn’t wear white clothes from school because my teeth were very yellow and 8 dentists told me the same thing “YOU HAVE THIS ENAMEL COLOR - GET UP WITH IT OR PUT VENEERS.” Thanks to the girl who wrote a review about this and I decided to try .. mine teeth whitened from the last shade to the first!! I use one syringe for 2 weeks, I do whitening 1 time per year or 1 time in 18 months. You don’t need to apply the gel on the caps with a strip; do not irritate. It is important not to eat coloring food for 10 days - beets, cha1, cola, etc., if your teeth are sensitive, then you can use nurofen. I didnt see any difference of 22 and 16% ,so next I will buy 16% again

Fantastic alternative to the exact same gel I had been purchasing from my dentist at four times the price. Terrific that this is available so inexpensively on Amazon. Works great. This is my go-to source from here on. Love It.

Have been using this for years; only reason for 3 Stars is that I can't find this in the 30% anymore. PLEASE BRING BACK THE 30 % STRENGTH!