The Kaiser patronised an American dentist in Berlin, who later wrote a book based on his meetings with him (Arthur N Davis: The Kaiser I Knew). According to him, the Kaiser was an extremely stoical patient (I imagine dentistry was a good deal more painful than it is now), but Davis didn't get much done on days that he visited, since the waiting room filled up with ADCs and after his appointment the Kaiser liked to stay and chat! However, his youngest son Joachim was a complete wimp in the dentist's chair.
Ann