After only two of the 20-minute treatments, my mouth aches and my gums are white!!! My teeth and gums are pretty healthy and I have used white strips and Colgate brush-on products with no side effects. I don't understand how you could apply this to teeth without getting any on gum lines, especially with the trays.

My teeth are about five to six shades whiter, but my gums are inflamed and bleeding in one area. Be careful not to get the bleach on your gums!

I do not recommend this product. I am writing this review fifteen hours after using it. At the time of actual use I had no complications. I made sure to not get it on my gums as the directions warned. At 1am I woke up because of the pain coming from my mouth. Then, I woke up every hour, as it grew worse. It wasn't my gums that hurt but my TEETH!! The air from just breathing in and out is excruciating against my teeth. I do not have sensitive teeth as I have done bleaching before with the Crest Strips. I am now missing work today to go in for an urgent visit to my dentist attempting to get some relief. I read the information that Rembrandt provides and nowhere in it does it say there might be pain of the teeth AFTER you use the product. The only warning about tooth sensitivity is a little red blurb that speaks of using less gel during the bleaching process.

I have been trying numerous products in order to whiten my teeth. Being a heavy coffee drinker, it seemed impossible for me to get any lasting resultsuntil now. Just last week I purchased the 2-hour Whitening product from your company and it's GREAT!! This is only after one application! I can't wait to apply the second tube. Thank you for such a fine product which a consumer can actually see positive results. My advice is "follow the directions"! This product is simple to use. I think most people get too anxious and just spread it all over their gums by accident. It's for "teeth, just as the packaging states.

Not bad, but don't expect brilliant results. Although the process only takes two hours, I've noticed the whitening seems to maximize in a day or so - it must need to sink in a bit. One thing to be very careful about is not to use too much gel for each application - the instructions call for a thin ribbon of gel, not so much that your gums burn off. I've found that just one tube provides enough for the four applications. I did try to use up both tubes once and put so much gel on that I burned by gums and turned the edges white. A little tingling is ok, but if things really start to hurt, take it out, you've put too much gel on.

After the first 20 minutes of using this product I could see immediate results! I thought it was easy to use and worth the time and money. I would recommend this to all my friends!

Loved this product! I only did my upper teeth to compare them to lowers - couldn't believe the difference! I was so excited with the results that I did my bottom teeth the next day. It's a great value as well.

My wife had this product sitting around and she liked it, so I tried it. I only used for an hour and my teeth got really white. It was so easy to use that I did it while I was watching TV.

My motto is nothing is perfect. But this is pretty darn close! I've used Rembrandt toothpaste for years now and its always done a GREAT job for me. So when this 2 Hr product came out I decided to give it a try too. It is a little pricey, but considering how much a professional bleaching would cost I went ahead and got it. Well, the process went WONDERFULLY. I have always had a nice smile but now people are even stopping me in the supermarket to comment on how beautiful my smile is. And for a woman of 74 thats saying a lot.

This product was so amazing. I can't believe how white my teeth got after just a few hours. Even my boss noticed.