Teeth Whitening Trays - Moldable, Trimmable, Custom Fit, Comfortable, BPA FREE, Latex Free, Dental Grade Guard - (4) Mouth Trays, Hygienic Case – Easy to Mold, Mouth Tray for Tooth Whitening

I’m glad I read the product reviews before actually going through the custom fitting process! Yes indeed, what you should observe is seeing the sides begin to “wilt” as an indication the material is softening. The first two fitting attempts, I pulled the tray out of the water and started the process, only to discover afterwards the tray hadn’t fully molded to an exact fit - so, I just stuck it back into the hot water, watched for the silt, and tried again. On my third “wilt,” the tray fit was perfect! I would recommend working on the top tray first, as it is a little easier to get your tongue to flatten out the upper inside of the tray, and your fingers to flatten the outsides against your teeth. That will help you achieve an excellent fit, when you repeat the process for the bottom teeth.The trays fit correctly, did not hurt to remove, rinsed out nicely in the sink, and dry quickly in their sturdy packable case. Time will tell how well they now work, for whitening or anti sensitivity gels.

I looked at several "boil and bite" trays for my teen to use with teeth whitening gel we got from our dentist. We wanted to lift some accumulated stains and brighten his smile. He needs braces soon, so getting the expensive custom tray from the dentist while his teeth are still crowded would be a big waste of money.I chose these trays because I was more uncertain about the quality, materials, and construction of other options offered by different companies. Some had very minimal information offered regarding their product. This was something to put into his mouth, so I wasn't comfortable with trying options that could have possibly been returned and re-sold, or materials that were potentially unsafe. (Although, in reality, many claims regarding products by sellers on Amazon at times seem questionable and nearly impossible to verify, especially with items unregulated by the FDA or other safety regulations.)We tried to follow the instructions for these trays as written. The molding did not go well. We tried to mold his top teeth multiple times with three different trays. The method did not seem to work well for us to manage to mold the tray to cover all the teeth.Twice, his trays ended up not covering the tops of his front teeth, which will not work for bleaching. We finally managed to get a somewhat usable tray for the top by using his thumb and index finger to push the mold close to and around his teeth.The trays also have to be softened to just the right point to get a good mold. However, if you don't get a great mold the first time you heat the tray and try to mold it, and you attempt to re-mold the tray by heating it again, the tray seems to shrink and become less moldable than the first time. Maybe this was just our experience.He managed to get one usable (though not great) bottom tray. But, even though these trays cost far less than the custom trays from a dentist, they still seem expensive, since we only have two sort of usable trays in the end.Perhaps an instructional video for molding, that demonstrated the correct look of the tray at the proper temperature for molding, using multiple people with both straight teeth and somewhat crowded teeth, would be helpful.UPDATE: After contacting the seller through Amazon, they offered to send replacement trays. However, they needed my address. I found it odd that they could not simply use the information from the previous order in some way. The trays are supposedly on their way. Will update again when received. Increased rating to 4 stars for prompt seller response, though I still feel $15 is a little pricey for 4 trays and a case, even with replacements.

Update:So I FINALLY got them to work. I had to put the water to a full boil although the directions say not too. After 10 seconds in the water, they were more moldable than before. Unfortunately when I went to put them in my mouth to fold, my back teeth folded over the edges on 3 of themBut they are doable and still much better than the insane price the dentist wants to chargeI had high hopes for this as it seemed to have the best reviews out of all of the ones I looked at.But I don't know what in the world is happening. They don't do anything. The don't wilt, certainly no worries about folding in. I was hopeful they would mold to my teeth anyways but nope.I left them in longer. I made the water full boil.They didn't move.After 3 trays I gave up and decided I was being punkd

First off, how well they whiten really depends on what you put in them. But getting the shape right has to be done too, for which I was wrongly skeptical. I boiled water in an electric teakettle, then filled a small gladware plastic container. Then with a thermometer I monitored the temp until it fell to about 180. Then I dipped the tray in long enough for the rims to start curling over inwards. If you don't see that, I think maybe it's not been long enough. At seven seconds for sure, but I'd say ten. Then I just followed the instructions I was skeptical about, which most importantly means pulling you upper lip taut on the tray by pulling with your thumb and index finger, one pulling on each side of your mouth to stretch your lip, all while creating a vacuum that draws your cheeks in, and holding for 30 seconds. And yes, as instructed,don't bite down. I was amazed how good of a fit resulted.

Really easy to mold the trays to your teeth and this kit comes with really detailed instruction. My teeth whitening solution is 20% because I worried about tooth sensitivity. After whitening 5 times for two-three hours each,I still have no sensitivity and teeth look really good

I had custom teeth whitening trays from the dentist, but I lost mine and didn’t want to pay for replacements. I came across these and thought I’d give them a try. I was pleasantly surprised with how much I liked them. It was really easy to mold them to my teeth.I did use the one that didn’t fit as well as a test run, which I’m glad I did because I messed that one up. But on my second try I got it perfectly. I saw another review that suggested ‘sucking’ on the tray once it came out of the water and I thought that worked well, in addition to pressing the mold against my teeth with my fingers. It only took a couple minutes total to make them.They fit snuggly in my mouth and cover all my teeth, I’m definitely happy with them!