The Five Known X-ray Photographs of Hitler’s head, circa 1944
From my reading, he had habit of not brushing his teeth properly. As result, he had gum issue, cavities, and bad breath. (It doesn’t surprise me, I mean he was a basically a bum for a period of time in the 1920’s and kind of kept some of those traits even after he came to power.)
The x-ray plates are currently housed at the U.S. National Library of Medicine. Here’s more information on the images. Page 99 of the PDF document.