Works really well but makes teeth very sensitive (2008-12-09)
I have used this product for years. It does the job very well. My teeth are as white as can be with this. Only complaint is the sensitivity I experience. I do have the professional molding of my teeth done by a dentist for this and was told to place a very tiny drop into each section and then push it upwards to cover teeth, also to take a q-tip and wipe my gums for any excess even doing all this I still get some sensitivity.

Very Pleased (2008-09-15)
I was very pleased with the timing of shipping and packaging with this product.
Also it is exactly what I expected and was promised.
Ive saved alot of money compared to the cost of buying through my dentist.
Thank you.

Nice product (2008-09-05)
This is a very good option for whitening your teeth if you don't have the cash to go out and do it using laser (fastest, in one hour you're done). This product is good, you can see the results almost immediately, but it does give you a lot of sensitivity while you're in the treatment.

you need trays (2008-06-29)
I can't tell if this product works because I don't have the trays that are needed from your dentist. One reviewer said that he used cheap mouth guards from WalMart. I tried this, but they didn't fit well at all, and the product was coming out and not against my teeth - gag. I would recommend that you buy this only if you already have trays from your dentist.

It Works! (2008-02-22)
Opalescence PF 20% whitened my teeth beautifully. By the third time I could notice a definite difference. My dentist recommended that I put sensitivity toothpaste in my bleaching trays and wear for 30 minutes before I put in the Opalescence. That was excellent advice for me, because I would have had tooth pain if I hadn't. I did have a little tooth sensitivity for the first few minutes, then it went away. I also rubbed the sensitivity toothpaste over my teeth when I was through bleaching, as recommended by my dentist. I will use Opalescence in the future for maintance, but will use the 15 or 10%.