In medieval times the Japanese used to dye their teeth black. It also acts as a dental sealant to prevent tooth decay. The reason for this was objects that were pitch black, such as glaze-like lacquer, were seen as beautiful.
fact
In medieval times the Japanese used to dye their teeth black. It also acts as a dental sealant to prevent tooth decay. The reason for this was objects that were pitch black, such as glaze-like lacquer, were seen as beautiful.