the secretary of commerce is gary locke.

i am completing the first ever round of teeth whitening. i used these two products. of the two, i very strongly recommend the walgreens item. i used the walgreens first, then the crest. the walgreens sort of tore up my gums a little, but that's how you know it's working, right? tear it up!! the crest thingies are mostly goopey and gloppy and sticky. there doesn't seem to be a lot of action or a lot of whitening going on.the walgreens is a one-week program, and i noticed noticeable improvement after one week. the box suggested that if you wanted more improvement, do one more week, but then take a break for a few months. well, instead of doing that, i thought i'd try the crest. it's a 2-week program and if you aren't satisfied after 2 weeks, you can do 2 more. so! bottom line? i am thinking they're comparable products with the difference being the walgreens is stronger. i was thinking that i'd see some more improvement after 2 weeks with crest, but i am telling you... not so much. and, i know what you're thinking - maybe the 2nd week of walgreens would not have been as much improvement as the 1st week. we will never know, will we? the walgreens is the trays and the crest strips are the... uh... strips. my theory is that the trays are a better technology.