Crest 2 Hour Express Whitestrips and 3D White Rinse Review

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(More customer reviews)It's a box of four sets of whitening strips. It seems to suggest that this OTC whitening strip finally contains enough concentration to whiten enough in merely 2 hours that the effect will last 3 months, as the box suggests that it's good for a year's supply. Typically over the counter whitening strips doesn't contain nearly high enough concentration of peroxides, that only after multiple and frequent applications will any results start to show. I wonder if this is different.
Application is painless. It doesn't even suggest brushing your teeth first (in fact it recommends that you don't brush your teeth immediately before application). The whitening strips has a relatively thick layer of gel, and the substrate film material is very pliable yet durable. Its purpose is trying to simulate a dental office treatment, where your teeth will be immersed in a tray of (highly concentrated) peroxide gel/mud. It stuck to my teeth with little effort and dexterity. Within minutes, my teeth was engulfed in a bubbly peroxide bath.
Having this on feels a bit strange in the mouth, and I talked like I had a big tongue, but I tried to carry on as normal. It stuck to the teeth very well, despite my biting right over the strips and licking them. The bubbly area also largely stayed put, and little disturbed by saliva and movement of the lips and tongue. Bubbly substance does seep out in the form of thick gooey film(or it's just a mixture of saliva and gel substrate). My teeth felt the effects: I wouldn't call it discomfort, but after 5 minutes I started feeling something is happening to my teeth, though it's very slight (and probably depends on people's sensitivities).
Taking it off after two hours was easy: just rip it off. I deliberately left a few teeth half covered to see if there are any before/after differences. I noticed that many of my teeth developed white marble-like patterns, or probably what the instruction referred to as "white spots". It seems to develop around areas where the teeth's surface may have imperfections and crack lines. It's said to eventually go away and I believe it.
Thus interestingly, while I wasn't expecting much effects, it seems to have done something. Alas, the experimental tooth where I left half uncovered didn't reveal much difference between the treated and untreated area, other than the marble pattern of white lines that formed on the surface of many treated teeth. I probably have deep coloration problems that cannot be treated by surface oxidation through a moderate peroxide concentration? Anyway, in other words, it didn't work all that much for me.
That said, those white marks on my teeth suggests that the strips did contain a decent amount of peroxide concentration to at least show its effects in two hours, which is on the faster end of average home treatment strips. I had my friend try it and it didn't seem to make that much difference for her either, however.
Therefore, while the active ingredient seems to be layered on thicker and more concentrated than average, it still doesn't seem to whiten that much for us. I wonder if more applications will help, but certainly not at only 4 times a year or once every 3 months. It's probably not strong enough to give off that much lasting effect with such infrequent use.

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Use Crest 3D White 2 Hour Express Whitestrips for visibly whiter teeth in just 2 hours. For a little time commitment, you'll see noticeable results. And you only need to use ONE treatment to get results that last three months. This package includes four separate treatments, enough to keep your teeth white for an entire year. Crest 2 Hour Whitestrips use the Advanced Seal, no-slip technology that allows you to talk, drink water and go about your day while you whiten with no sticky mess. They're also enamel safe and use the same effective whitening ingredient that dentists use.

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