Look down below for permanent repair options.
There are at least two brands of adhesives that are designed for repairing dentures. When my mother-in-law knocked her dentures on to the floor, I used the brand that was available at my local drug store. It was the D.O.C. (Dentist On Call) Emergency Denture Repair Kit ($6.49+tax). However, I suspect that the Sea-Bond Emergency Denture Repair Kit would have worked fine, if my drug store stocked it. Likewise for any similar products.
The repair kits have enough materials for a second try if you bond the broken dentures together at the wrong angle or make some other mistake.
My mother-in-law broke her dentures on Monday evening while the drugstore was open, so I was able to repair them that night. She wore the dentures on Tuesday without a problem. I was lucky and had a dentist appointment on Wednesday morning. While I was getting my teeth cleaned, my dentist checked my work.
I knew I had missed a little spot with the glue resulting in a tiny hole in the repair. She said it was too small to be a problem, as long as the dentures were brushed carefully. On the other hand, she felt a little sharp bump. She removed it with her tools. I didn't see the problem. If it happens again, I know to both look and feel for problems. I could have easily removed it with the sandpaper in the kit. I did manage to remove all of the other rough spots.
Now that my dentist has touched up the repair, she said it is safe to use for an extended period. She didn't charge me for the inspection. I brought the kit with me to the dentist, in case she needed the instructions for undoing the gluing.
The instructions say it takes 2 hours of soaking in rubbing alcohol plus cleaning to undo a repair after it has set.
Always have a dentist inspect the repair if you aren't going to get the dentures professionally repaired or replaced in the near future. Even a small bump can lead to irritation which can lead to permanent damage and bone loss. If you need more evidence, a google image search will turn up some rather scary pictures. Rather than attempt to gross you out, I'll just say really bad things have happened due to botched home repairs.
If the proper type of glue isn't available, don't even think of using a glue that isn't safe for use around food. Note that while many epoxy or super glue formulations will set into a form safe to have in your mouth, other formulations will not. If it doesn't say it is safe, assume it is not.
If you get the repair wrong with epoxy or super glue, they are very hard to remove. A botched repair may make it impossible for a professional denture repair technician to do the job right. Also, few, if any, household adhesives are colored to match dentures.
Most glues are not made to survive the hostile environment of a continuous warm and moist mouth. Overtime, the glues that are used to repair dentures will break away from your denture caused from the constant rubbing of food and saliva. This is one of the reasons why using any kind of glue just won't last. If you have repaired your denture with glue, in most cases it can be easily removed by a denture repair professional for a small cost. Perhaps after understanding why using any glues can be harmful, you may be interested in getting your denture repair professionally done by a dentist. Most Dentist's send their work to a dental lab from which a denture lab professional will correct the issue, but in our case we suggest you visit www.BrokenDentureRepair.net where all dentures are inspected by a experienced dentist and also repaired properly by an experienced dentist.