These things are huge! Even after cooking for the recommended time, I found they were still a bit firm. With a little effort, I was able to fit them to my teeth and get a fairly accurate impression. Definitely not dental quality, but good enough for their low price. The trick of the form is to press with your hands and suck the air out with your tongue. I also bought a second set and with the help of a pair of scissors and a bit of trial and error I was able to make some decent whitening trays. .
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