The theory is based on a newly discovered document that shows Hitler's dentist had about 11lbs of dental gold from the concentration camps at his disposal for the treatment of senior Nazis.

Co-author Henrik Eberle, a historian who has written several successful books on the Nazi leader, said dentist Hugo Blaschke had put 10 fillings in Hitler's mouth in 1944.

"The most likely place the gold came from is from the supply Blaschke had from the concentration camps," Dr Eberle told the Daily Telegraph.