OPALESCENCE 35% MINT TEETH TOOTH WHITENING GEL 4SY

This product works great. The 35% solution is much stronger than the other versions, and hence, you don't need to leave it applied for so long. The unofficial directions I received with my order said you can leave on the 35% Opalescence for up to two hours. However, the PDF instruction sheet that you can download directly from the Opalescence website, says specifically to not leave the 35% applied for more than a half an hour.

I would recommend that new users keep the solution on for less time in the beginning, gradually building up tolerance. The PF version also contains fluoride to help control sensitivity.

When first using the 35%, I left it on for about two hours, and I did experience some sensitivity. The sensitivity went away in a day or two, no problem. After using it a few more times, I am now able to leave it on for about two hours with no sensitivity whatsoever. I cannot imagine trying to sleep with trays in, because you definitely don't want to...Read more

When I first tried the 35% it burned my gums . Now I paint the whitening on my teeth with a tiny paint brush and then put the trays on my teeth & no burning they can stay on for 2 hours with no problem.

I have used this product before but always used 20%. I decided to try 35% this time. The first time I tried it, I applied it like I would the 15%. Big mistake. This product is much stronger. I normally kept the 15% on my teeth overnight but had to remove the 35% within 30 minutes due to the pain and discomfort. When I removed the tray, my gums were extremely irritated and inflamed. I did not re-apply that night. The following night (and this may sound crazy), I applied a thin layer of Vaseline to my gums prior to placing the trays on my teeth. I still felt a little irritation but not nearly as much as I did the night before. My teeth are much whiter. I do recommend this product but I do not recommend the 35% version. Try the 15% or 20% first. You will thank me later.