The 35% for 30 minutes made my gums turn white and bleed. Should I switch to 20% or 15% and which can be left on overnight??
1136471
I have used 20% over night many times, but since I got My teeth white I use 20% for 3 hours every other week
1136472
They say you should not swallow any of it. I don't know how anyone could leave this stuff in their mouth overnight without swallowing. I only leave in for about 15 mins at which point my gums become irritated. That seems to be enough time.
1136473
I'd stick with the 20%. It is definitely not as harsh as the 35% . 15% would take a lot longer to see the results and I find it's a bit too weak to get them bright enough. The 20% I find to be very effective and doesn't make my teeth hurt when the wind blows haha. Also strongly recommend sensodyne toothpaste.
1966021
Use every night for 1-2hours, in 1-2 weeks you will be able to know the difference on your teeth. Then you can just use once a month just to maintain the whiteness.
169754
I leave it a couple of hours. Don't get it on your gums, though. It can make gums sore.
1959552
My dentist told me to leave it in between 15 to 30 minutes, twice a day. Sensitivity will determine how long you leave the gel on your teeth.
2142413
I leave it on for 30 minutes. I wouldn't go lower than 15 minutes and I have kept it on as long as an hour. I figure it will only strengthen your teeth. Just watch TV or go on the internet, it goes by fast and your mouth feels really refreshed.
1165530
I use trays all the time wile whitening, leave them in for about 30 mins morning and then before bed
1806006
In my opinion, those work better than the 2 hour strips. They do about the same whitening, it's just that you don't have to go through having them in your mouth for 2 hours
451995
I just used 20% salicylic last night on my face and the white frost appeared around my mouth only. This morning it still burns and is darker in color, not to mention dry. I'm a little freaked out by the discoloration. Will try to update results. If anyone has had this happen would love to hear results!!!
383290
I bought mine about 6 mos ago and don't have the whole package. I like it. It says to leave for 15 mins but after the 1st time with NO sensitivity I leave it longer now. I didn't work as fast as the one I got from my old dentist but it is does not leave your teeth or mouth feeling as sensitive as the one from him. I did notice a difference after the first time use but had to use 3 times to get the whiteness I wanted.
41804
Further to my last comments. There are different strength available. The one I originally received from my dentist was the overnight formula. The one I purchased afterwards was stronger, thus the two-hour directive.
16711
My dentist says to leave it on for 45 mins at the 35% level. If you are looking for something that you can keep on longer, the 20% formula can be worn while sleeping, as it stops working after 8 hrs. The 35%, as this is will make your teeth more sensitive, and be sure to brush them with toothpaste not just rinse when you remove the trays.
791814
Hi Emily, I bought it and also the whitening for 7 days that each strip it's 30 min, I can tell you that the 1 hour it's stronger so you use only one or two and it's really work.. It's better bc it is stronger .. I put it less than 1 hour bc my teeth wasn't so bad.. It is depend how white you want it, hope I helped you.. And sorry about my English I'm not American ... :)
2162948
I put mine in every night for about a week and a small amount in across the mouth guard. Gently squeeze so that a small amount goes across the front of the guard for each tooth. Works great,,, If you teeth become too sensitive you may skip a day.
777557
If you have no gum discomfort, start with 20 minutes and work your way up. I use it for an hour.
2178434
Yes; after just one brushing, my teeth were SHOCKINGLY white. 2 shades to be exact. It's like a dentist's cleaning!!!
900693
My husband uses this strength and leaves it on 40-45 mins. It works for him because he has no gum sensitivity.
319563
I believe 15 minutes like ot says on the instructions, though I caution you this is not a safe product!! It will eat your gum line and turn it white, like dead skin! It also burns incredibly bad! Dont put yoir oral health at risk!