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In page Teeth blackening:

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In the Muromachi period (1336–1573), ohaguro was generally seen among adults, though when the Sengoku period (1467–1615) began, so as to prepare for political marriages of convenience, when the daughters of military commanders were around 8 to 10 years old, they would blacken their teeth as a marking of their coming of age. Relatives and guardians of the bride who blackened their teeth were called kaneoya (鉄漿親). It is said that military commanders who were struck in the head on the battlefield and who did not want to be ugly[citation needed] would wear average women's makeup and would blacken their teeth. These faces imitated the Noh masks of women and young boys.