I didn't notice any change until 3 weeks later but my teeth definitely got whiter. I had an issue with one strip not sticking, but I think it was because my teeth were wet (bottom row). it would be nice if the best bet was on the box. I have junk teeth. 30 minutes every day for 6 days, 2 days off (read how the strips should be used, so change the time to 60 minutes) 1st time, 7 days off, and the last time was 2 weeks ago. Teeth were fine after 30 minutes but daily use didn't seem to change. It was at this point that I noticed that my teeth were actually whiter. I left the 6th for a few hours and had no problems. the next one seemed good but after another hour of use I removed the strips, my teeth were very sensitive. The next and last strip I used I took off after 20 minutes because my tooth started throbbing and continued to throb for about 30 minutes after rinsing my mouth. The product works. a slimy texture that foams up when you move your tongue. if i knew now Try 45 minutes once a week. my "normality" is that i can brush my teeth 20 times a year, i.e. like I said at the beginning, junk teeth
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