How did ancient people clean their teeth?

Use tea to clean teeth, and the role of tea is even greater. It can not only soak and drink, but also preserve health. Of course, it also has the effect of removing dental tartar. At the end of the song dynasty and the beginning of the yuan dynasty, the book of prolonging the life of the three-yuan counselor recorded gargling with tea. The original text is: "When eating and drinking, you can gargle with strong tea, which will make you tired, while the spleen and stomach are self-harmonious. Where the meat is between your teeth, you take tea to wash it, and you are not picky or too lazy to take it off. " "It is difficult to hide your teeth, so the stronger you are, the more stupid your teeth are." It also refers to the benefits and methods of gargling with tea.