Opalescence 10% Gel Syringes Teeth Whitening - Refill Kit (4 Syringes Total) Carbamide Peroxide. Made by Ultradent, in Melon Flavor. Tooth Whitening Refill Syringes

Great if you have bleaching trays. Much less expensive than buying at the dentist.

They work!

Much cheaper than dentist office. Same stuff.

I have only used this two times and I have to stop due to my teeth already becoming painfully sensitive. I have started to notice my teeth getting whiter in just two uses so it's a bummer to stop, but the discomfort is too much. I already use sensodyne toothpaste for sensitivity so I was at a disadvantage from the beginning, but if you don't have teeth sensitivity definitely give this a try!

Worked with my aligned. Very pleased with the results.

I used it for two nights. It has whitened a great deal. I am not sensitive to it. I did laser once. It was awful the amount of sensitivity. This is great. I will also buy Sensodyne toothpaste to use as well.

Been using this product for 20 years never disappoints.

These are PF and contain potassium and fluoride. The ingredients need to be updated. I won't be able to use these because I thought they were pf free.