These did not work well for me, especially for the cost. ($30-$40 for 7 days worth)

They made my teeth VERY sensitive, more than Crest, MUCH more than Rembrandt. I noticed a lot more white spots than usual, not that I care about those, because I know they will go away.

Disgustingly, the gel floats out of the (cheap, flimsy) trays and around in my mouth in little blobs, causing me to have to keep a spit-cup nearby while I am using them. Makes me question the effectiveness, if the gel can’t stay in the trays.

But most troubling, the strips only whitened the bottom half of my upper teeth. If you can’t whiten the whole tooth, then you’re useless. The tye-dye look is not for me.

I recommend Rembrandt strips. They are more “obvious” than Crest strips, but they seem to whiten the best of the three, and they stay in place.