Is it safe to use super glue containing cyanoacrylate to fix broken dentures?

Yes and no: Saliva slowly dissolves this glue, so the fix is only temporary. After it comes apart again, the margins needed fit together are sometimes not clean enough to do that.

Yes.: It dissolves in saliva and won't last long. It will also blur the edges of the fracture making a proper repar harder.

Yes: It will eventually be disolved by the saliva leaving the borders of the plastic harder to repair.

Not really: Cyanoacrylate containers say avoid contact with skin. Not supposed to be used in the mouth. If you repair it with this, it also messes up the laboratory when you do bring it in for proper repair.

Bad idea: Cyanoacrylates do not stand up to the wet conditions found in the mouth. The fix will be temporary, messy and poorly aligned. Leave the repair for the dentist. This fits in the same category as the warning on tv that says, "do not attempt this at home. Our drivers are trained professionals.".

Repairer beware: I have found that when patients try to repair their own dentures, not only do they not fix them properly, but they cause more of a mess and a problem, both for themselves and me as their dentist. It often takes more time and is more costly to then repair them. This is a case when one should definitely leave these matters to a trained professional. There is a reason that the denture broke!