"Sanitary beard" is not a patent in Japan, and it was also very popular in Germany during World War II.
-"The Cause of the Birth of Sanitary Beard"
This kind of beard was very popular in Germany and Japan in the 1930s and 1940s.
Because it is usually difficult to shave off a long beard, it has something in common with Japanese Bushido, so it is regarded as precious, and there are only a handful of squares in the middle. Because that style of beard is convenient for daily cleaning and combing, no long beard will fall into the rice when eating, so it is called "sanitary beard" and because its shape is similar to that of a scrubber, it is also called "brushing beard".