French researchers claim to have put an end to conspiracy theories surrounding the death of Adolf Hitler, after a study of his teeth proved he definitely died after taking cyanide and shooting himself in the head in Berlin in 1945.

The researchers reached their conclusion after they were given rare access to fragments of Hitler’s teeth which have been held in Moscow since the end of World War II.

"The teeth are authentic, there is no possible doubt. Our study proves that Hitler died in 1945," said professor Philippe Charlier.

"We can stop all the conspiracy theories about Hitler. He did not flee to Argentina in a submarine, he is not in a hidden base in Antarctica or on the dark side of the moon," he told AFP news agency.

The teeth were put on display in 2000 in Moscow as part of an exhibition to mark the 55th anniversary of the end of the war.

They were back in the news again last month when the memoirs of a Russian interpreter who worked in Berlin in 1945 were published in English for the first time.

She recounted how she had been tasked with proving Hitler's death by tracking down his dental records in the ruined German capital and seeing if they matched a set of teeth she had been entrusted with - which they did.