According to Cornelius Ryan in The Last Battle, an assistant to Hitler’s dentist positively identified a piece of bridgework that she helped apply to Hitler’s uppers in 1944 or 1945.
This was supposedly confirmed by a Soviet examination of the skull of one of the bodies that was burned outside of Hitler’s bunker.
However, Stalin’s Russia had already revised the story at least once, after they had first released photographs of Hitler’s dead double and then released official autopsies of the burnt body that indicated that Hitler took the cowardly option of taking cyanide along with Eva Braun. They further confused the story by later claiming that Hitler committed suicide by shooting himself though the roof of his mouth, although John Toland cites numerous eyewitnesses who say he shot himself in the right temple. Who the hell knows what those maniac Commies were thinking.
Eva Braun, Joseph Goebbels, and Goebbels’ family were killed by taking a rather new version of cyanide-based poison, which was first tested on Hitler’s dog for lethality.
Nobody of repute disputes the fact that Hitler committed suicide in his bunker complex in Berlin. The complex, thoroughly mapped and reproduced in several books including Ryan’s, covered some two acres, some of it underneath a park, in downtown Berlin.
It’s as close to Hell as any mortal could wish to get, in my opinion.