Ohaguro

lit. 'black teeth' (お歯黒) is the name given in Japan to the custom of blackening one's teeth with a solution of iron filings and vinegar. It was especially popular between the Heian and Edo periods, from the 10th century until the late 19th century, but the opening of the country to Western customs during the Meiji period led to its gradual disappearance. It was a tradition practiced mainly by married women and some men, almost always members of the aristocracy and samurai. In addition to Japanese society's preference for black teeth, it was also considered beneficial to health, as it prevented tooth decay by acting as a dental sealant. The practice of dyeing one's teeth black was also a known and widespread practice in southeastern China and Southeast Asia, although with different recipes.

Etymology
The word is composed of the honorific prefix o- (お), the term 'tooth' (歯), and the term 'black' (黒). Due to a phonological process called, the "k" in kuro voices to become a "g" sound, and the compound term is pronounced , not.

The term ohaguro arose among upper-class women in the early Edo period as part of nyōbō kotoba or "women's language", as a shift from the much-older term 'tooth blackening' (歯黒め). is normally spelled お歯黒, but there is an alternative spelling 鉄漿 where the kanji literally mean "iron juice", alluding to the liquid used in the process. This alternative spelling also has a separate pronunciation, tesshō. Synonyms include 'nutgall water' (五倍子水), literally 'metal + putting on' (鉄漿付け), literally 'putting on + metal' (つけがね), and 'tooth blackening' (歯黒め).

Origin and meaning
existed in Japan in one form or another for hundreds of years, and was considered a symbol of beauty for much of this time. Objects with a deep black color, such as those lacquered to a glossy black, were considered to be of great beauty, and many shades of black were used in dyeing kimono, with different shades holding different meanings.

The reasons for the invention of are still unclear: simple dental care has been proposed, as well as the differentiation between humans and demons depicted with large white fangs, just as in other Southeast Asian cultures; the fact that teeth are the only visible part of the skeleton, which links them to death and makes them taboo; or the Japanese and other Far Eastern cultures holding a preference for concealing the public display of feelings with the combination of  (white makeup), the complete plucking of the eyebrows, and their repainting – a practice known as hikimayu (引眉) – and the dyeing of teeth creating a masklike appearance. The current Japanese female custom of covering the mouth when smiling derives to a greater or lesser degree from this consideration and from the preference until the 19th century for black-toothed rather than white mouths.

Among the samurai, its origin is associated with the idea of loyalty expressed by the color black. When a samurai dyed his teeth black, it reflected his decision not to serve another lord for the rest of his life, and, from the time of the or regents of the, the nobles applied it with similar regard for loyalty.

History
The first written references in Japan to appear in the 11th century Tale of Genji and in the story, in English The Lady Who Loved Insects, from the 12th century, included in the. In the story, the protagonist's eccentric behavior is considered less reprehensible than her repulsive natural appearance, and a maiden describes her completely unplucked eyebrows as "hairy caterpillars" and her undyed teeth as "skinless caterpillars", while a captain of the guard who shows attraction to her is repelled by her lack of makeup and, above all, by her teeth which "shone horribly when she smiled."

The tradition first appeared among men and women of the Heian period aristocracy between the 9th and 11th centuries, which was soon followed by women of all social classes. It began as a rite of maturity among adolescent girls that by the end of this period had spread to noblemen. During the later Kamakura period, when aristocrats such as those belonging to the Taira clan, other samurai, and almost all nobles came of age, they dyed their teeth. In the particular case of samurai and members of the nobility of these periods it was customary to dye their teeth for the first time upon passing their or initiation ceremony, at the age of fifteen or sixteen. This was also how it was done in the court of the Imperial Family until the end of the Edo period. Although its specific use by elites was soon diluted and came to be considered acceptable among commoner women, especially among married women and geisha, it was a forbidden practice for the marginalized or, vagrants and the poorest of the poor.

During the Muromachi period, was common among adults, although even before the advent of the Sengoku period it was more often among nobles as a sign of the passage into puberty and was done on boys and especially girls entering that stage, around the age of 13. In the celebration of marriages, those relatives of the bride who were responsible for assisting her in the process and introducing her to others were given the name kaneoya (鉄漿親) or, literally "godmother" of (blackening of teeth).

Throughout these convulsive centuries, which saw the emergence of a multitude of at odds with each other and led to the wars of the Sengoku period, samurai would take the heads of their enemies and collect them as trophies after battle to enhance their reputation in the eyes of their. The heads were identified and in many cases received after decapitation to enhance the combatant's glory in defeating a notable enemy. In the, in English The Story of Oan, the daughter of a servant of Ishida Mitsunari narrates this process after surviving the Battle of Sekigahara in 1600:

"Our allies stacked the severed heads they had obtained in this part of the castle. We put a label on each of the heads so that we could identify them properly, then we dyed their teeth black repeatedly. Why did we do this? Long ago blackened teeth were admired as a symbol of a distinguished man. So we were asked to apply a generous coat of ohaguro to any head with white teeth."

It was towards the end of this period that the men engaging in the practice became a minority.

During the Edo period, only men who were part of the Imperial Family and the aristocracy had their teeth blackened. Because of the strong odor and the effort required for the process, in addition to the impression among young women that it made them look older, was only performed on women who were getting married or engaged, prostitutes, and geisha. There are also mentions of in fairy tales, such as Gon, the Little Fox, by Niimi Nankichi.

In 1870 the government banned the practice of on men, and the tradition gradually became obsolete, especially from 1873 among married and noblewomen, when the Empress Shōken decided to appear in public with white teeth. Until the last years of the Meiji period, was still a popular custom among the middle and lower classes but from the Taishō period onwards it virtually disappeared except among elderly women in rural areas.

Nowadays, the only places where can be seen are some Japanese festivals, in period films, in kabuki, and in some  (geisha districts), where some apprentice geisha have their teeth blackened during the last stage of their apprenticeship,, before graduating to geisha status. The application of and the hairstyle known as, both traditionally characteristic of Japanese newlyweds, is a symbol of their "marriage" to the arts they practice.

Social consideration and role


Following the ending of Japan's self-isolation policy in the 1860s, a large number of Westerners who visited Japan – including Engelbert Kaempfer, Philipp Franz von Siebold and Rutherford Alcock, who visited Edo-period Japan – described as "an abhorrent Japanese custom that disfigured their women",  whom, in fact, many of them considered to be of great beauty until they smiled. Alcock surmised that its purpose would be chastity by intentionally making women unattractive, which would prevent potential extramarital affairs and his view of this custom hardly changed during his three-year stay in Japan:

"Once they have renewed the black varnish on their teeth and plucked every last hair from their eyebrows, Japanese married women could assert their unparalleled preeminence in artificial ugliness over the rest of their sex. Their mouths thus disfigured are like open sepulchers [...]"

Japanese sociologist Kyouji Watanabe disagrees with this theory. Considering that Japanese girls were allowed a high degree of social and sexual freedom until the moment of receiving the, when they accepted their responsibility as a wife and mother, Watanabe posits that this was a social ritual by which both society and the young woman affirmed the determination of the woman who had matured.

Dye
The main ingredient was a dark brown solution of iron acetate called lit. 'iron juice water' (鉄奨水), created by dissolving iron filings in vinegar. When the solution was combined with vegetable tannins from sources such as powdered galls of the Chinese sumac plant or tea, it turned black and ceased to be soluble in water, the same method by which iron gall ink is produced. Covering the teeth with this liquid prevented decay of the teeth and enamel and was also said to ease the pain of dental ailments almost immediately. The dye faded quickly and had to be applied once a day or every few days to keep the dark shade even.

Among foreigners who knew of the custom, a rumor, never proven, spread that the ingredients also included urine. Algernon Freeman-Mitford transcribed in his Tales of Ancient Japan a recipe which he claimed had been described to him by a reputable apothecary in Yedo:

"Take three pints of water and, having heated it, add half a cup of wine (sake). Put into this mixture a certain amount of red-hot iron; let it stand from five to six days, after which there will be a residue on the surface of the mixture which you should then pour into a small teacup and place it by the fire. When it is hot, you should add gall powder and iron filings, and you have to heat the mixture again. Then the teeth are painted with the liquid by means of a soft feather brush with more iron and gall powder and after a few applications, the desired color will be obtained."

In kabuki theatrical performances, actors painted their teeth black whenever they played married women, courtesans, and with some noblemen, for which they traditionally used a mixture of brown sugar and pine resin. The mixture used in kabuki was given the name, and in more complex formulations could include wax, pine resin, carbon black, red pigment, rice honey, and lamp oil, all softened over a flame.

Application
For the treatment, preservation and application of the dye, various containers and tools were used. Among these were the, a large bowl with handles on which was placed the , a thin tray to hold the elements with which the dye was applied. The set of smaller items was kept inside a larger case: the, in which were kept the or small box for the gall powder; the , with which the dye was administered; and the , a small porcelain bowl for gargling after the process.

Each time the procedure was repeated, the teeth were carefully rubbed with the peel of a pomegranate to form an adhesive surface for the dye. According to Freeman-Mitford, the dye should be applied at most every two days, because even after the first day without a new coat, the teeth lost their lacquered shine and pieces of gray were mixed with those that maintained the desired black color, resulting in a repulsive appearance.

Superstitions, legends, and popular expressions

 * During the Meiji period, an urban legend spread that the coal tar used as insulation at the beginning of the extension of electrical wiring throughout Japanese cities was actually composed in part of the blood of virgins, an idea that became associated with the Westerners who were originally in charge of installing the wires. To avoid being attacked and have their blood drawn, many young women decided to change their appearance to look like married women: they dyed their teeth black, painted their eyebrows, wore simple kimono, and styled their hair in the style.
 * In Yamada Norio's book, in English Journey through the ghost stories of Tohoku, there is a story about Fukushima prefecture called lit. 'full of blackened teeth' (お歯黒べったり). It is about a , more specifically a type of , dressed and made up in the old Japanese women's fashion, but on her made-up face appears only a large mouth full of black teeth.
 * A legend from the island of Himeshima tells that when Himegami (姫神) fled from Prince Tsunuga Arashito of the Gaya confederacy, she stopped for a moment on her journey to apply . When she then wanted to rinse her mouth she found no water anywhere nearby, so she clapped her hands and water began to gush out of the ground. That is the reason why the Hyoshimizu spring at Himekoso shrine is also called (' water').
 * The main red-light district in the country between the 17th century and the prohibition of prostitution in Japan in 1958 was Yoshiwara, in Edo. The district was surrounded on all four sides by a small moat with water that received the name, literally 'Black Tooth Canal', because of the abundance of prostitutes with dyed teeth.

Other parts of East Asia
In China there has been knowledge of the custom of teeth blackening throughout history, although it was not practiced in the domains of the Middle Kingdom, nor did the majority of its ethnic groups. As early as the 4th century BC's, the description of a 'black-toothed country' or (黒歯国) appears, which some associate with Japan itself and most others with the Southeast Asian area due to its extent in the region and greater antiquity.

In more modern times, tooth blackening can be observed among many minority groups in Southeast Asia. It is found preferentially among older women, although the practice still exists among some young girls. Sometimes artificial teeth were used to obtain black teeth although it is also very common outside Japan to achieve this result by continuously chewing betel nut, which gives a dark red shade instead of black, in addition to all sorts of plants collected mainly in the jungle.

The practice of teeth dyeing was very ancient in Vietnam, where it was considered a demonstration of maturity and readiness for marriage after puberty. It was also a demonstration of civilization, as there was an idea that white teeth belonged to animals, savages, and evil spirits, especially because of the presence of large protruding canines in all of them. The majority ethnic group in Vietnam, the Kinh, practiced this custom, as did various minority populations. Si la men painted their teeth red, while women painted their teeth black. These traditions declined in the 20th century, decade by decade with each new generation, although colonial medical reports from the 1930s stated that 80 percent of Tonkinese farmers had darkened teeth.

Peoples who practiced some form of tooth blackening outside of Japan include:


 * In China, in Yunnan province, especially in Xishuangbanna prefecture, the ethnic groups: Jino, Blang, Dai, Yi, and Lisu.
 * In Vietnam, the Si la, Kinh, Thổ, Nung, Maa, Mnong, and Rade ethnic groups.
 * In Laos, the Khmu ethnic group.
 * In Thailand, the Lahu, Akha, and Lisu ethnic groups.
 * In Malaysia, the Malay, both in Peninsular Malaysia and Borneo, and the Jakun.
 * In Indonesia, the Dusun, Dayak, Karo, Kodi, Alfur, Kedang, Ngada, and Batak.
 * In Philippines, the Isnag, Aeta, Bicolano, Mangyan, Mansaka, Mandaya, Manobo, Yakan, Achinense, Minangkabau, Ivatan, Tausug, Bagobo, Kankanaey, Igorot, Gaddang, Ilongote, Makassar, Ifugao, Sondanese and Javanese.
 * In the Pacific, the islands of Palau, Yap, and the Mariana Islands.