Definitely worked but I found that the results weren't long lasting (I am a coffee drinker though). Great to use for an event though.

I used the regular whitestrips, not the 3D version. They were effective and gave noticeable, quick and lasting results even on already white teeth. The product definitely brightens up your smile. The test strips (before the product was available in Canada & was being tested in the US), were larger and held better to the upper and lower teeth. The strips were broader allowing them to be easily wrapped behind your teeth. That being said, it's not easy to keep both the lower and upper strips in place at the same time for a treatment. It's hard enough trying to keep one strip from sliding out of place. The product is on the pricey side but worth a go for an at home treatment that isn't time consuming or messy and works.

These work really well and my dentist told me they are pretty much the same thing that the dentist sells but I found they made my teeth extremely sensitive.

These were not cheap full price, but I did find them on sale! I found that these strips were far too intense to use at the recommended rate. My teeth were sore after daily application, and became super sensitive - something I wasn't into. However, once I switched to using them once every two days, my teeth were not in pain, and I noticed a MUCH whiter smile which lasted for months! My dentist also said that using the whitestrips myself was a smart buy, because I was able to control the intensity of them (how often/long I used them for) rather than professional get my teeth whitened. My teeth are generally white enough, but these really took my smile to catalog-level ;)

easy to apply works great and its worth it but its a bit expensive.

These strips work well, they definatly white your teeth, although the price could be a bit cheaper.

The price is very much affordable, however, the strips are really painful and kind of not too effective, well for me.

I like this for what it does...it whitens your teeth and I like that about this product. But I don't think that it's for me. I guess it's for someone who doesn't really have a problem of having too yellow teeth, but this just didn't cut it for my bottom teeth. It was always sliding all over the place and I ended up drooling so much (very sexy) and I hate that it doesn't whiten the back of your teeth. For the price I wouldn't repurchase this.

Noticed a difference within the first couple of days ....would really like to get this product again - it has been a while!!

Crest Whitestrips are easy to use, and work quite well. They are a thin plastic strip that sit on the teeth for about 30 minutes, and I have seen noticeable results after one use! The only downside to this product, is that it can make your teeth VERY sensitive afterwards, which can last for an entire day. I have tried toothpastes to help with this sensitivity, and even painkillers, but to no avail. The sensitivity and pain is no where near as bad as the trays I tried from my dentist, which were unbearable. If you would like a quick way to whiten your teeth, and do not care about a little sensitivity in order to achieve a great smile, then I would definitely suggest this product. It is the best whitening system I have used so far.