Why did some Japanese women in ancient times dye their teeth black and shave their eyebrows?

As early as heian period, there was a custom of flirting among nobles. Books such as "Pillow Grass" and "Diary of Purple Department" all record: "The ladies dyed their black teeth and put on red makeup on clothes (women's adult ceremony) and celebrations." The Japanese makeup custom of dyeing black teeth lasted from the verifiable Asuka period (even earlier) to the Taisho period of the 20th century. The reason has to start with the racial origin of Yamato nationality, because the makeup style of any nationality is bound to bear the historical imprint of this nationality.

There are records about the country of wringing teeth in Shan Hai Jing, and some studies think that early Japanese aborigines and Taiwan Province aborigines had similar custom of wringing teeth. At the end of the Japanese heian period, when aristocratic men and women were going through the ceremony (equivalent to the coronation ceremony in ancient China), warriors and waiters would dye their teeth black. Emperors and extended families in the Edo period also had the custom of raising their teeth and eyebrows at special ceremonies (shaving off naturally growing eyebrows and drawing vague trace lines).

Those who dye their teeth black must be married women; If the teeth are not only dyed black, but also the eyebrows are shaved, it must be a mother with children under her knees. Dyeing teeth black seems terrible to modern people, but another purpose of dyeing hair is to prevent tooth decay and periodontal disease. Women with pregnancy experience should know that during pregnancy, because the fetus will absorb the calcium of the mother, which will affect the mother's teeth, the habit of dyeing hair is not entirely a decoration.

The above is a record of the health effects of black teeth in Edo, Japan. I believe this has something to do with the custom of black teeth started by the ancients. And every country and every dynasty has its popular makeup culture. This is the same as the reason why our country regards thinness as beauty and whiteness as beauty. Just understand.