Dark pools, as the name suggests, dye their teeth black. Ancient Japanese women dyed their teeth black with iron paste. This kind of iron slurry is not the kind of molten iron you think, but the black water leached by pouring iron filings into wine, vinegar, tea, etc. And brush it on your teeth with feathers or brushes.
At that time, people's aesthetics were like that. Women will paint their faces white with white powder, so that their teeth will look yellow. To make up for this shortcoming, they will simply dye their teeth black. This is also the need for makeup. At that time, only the best people could draw black teeth, because the production of iron slurry was very complicated, and makeup itself took a long time. This is not enjoyed by ordinary working people. So it is also a symbol of status.
At first, the teeth dyed black were regarded as a symbol of women's adulthood, and later gradually evolved into a symbol of married women and unmarried women. There is also a saying that it will protect teeth, but it was later falsified by science.
The custom of Japanese women shaving their eyebrows originated in the Tang Dynasty. Women in the Tang Dynasty used to shave off their eyebrows and stroke them themselves. Later, it was gradually introduced to Japan, and influenced by it, Japanese women began to make up like this. Shave off the original eyebrows and draw two short and thick eyebrows in the center of the forehead, which was called silkworm eyebrow shape at that time.
At the same time, shaving eyebrows is also a sign of married women. At that time, older unmarried young women would say, "Why don't you shave your eyebrows?" .