actually, I have heard from ppl i know that it is possible and they turn out ok after, but not as good as proffessionally done. (he used sandpaper and hot water from what i heard)...anyhow, what i was told last week or so when i had to have mine re adjusted, was that after so many months, (or if youve recently had surgery) your gums shrink, or sometimes resize., sometimes due to eating habits, (if you eat with or without them ect or use polygrip ect) all kinds of things can cause the dentures to need to be resized. actually, after having them re adjusted, (luckly enough I have medicaid or i would be lost without them lol)...they fit alot better, but they told me to come in in a nother month or so to get them re fitted, (if i needed to and they messed up somewhere because of other paitents they take care of too)...anyhow, when i watched them do mine, they used like a silicone pasty thing, and had me bite down into the mold, (Teeth were attached to molding), and i think it dries and hardens, and then they shave it down to the mold, (prolly where the sandpaper idea came in)...anyhow, I hope that helps, gl with the idea..