Human ancestors had the habit of gargle and brushing teeth. In 3000 BC, the first tool for cleaning the mouth was found in the tomb of the Sumerian Ur city-state, the tooth stick, one can last for two weeks. In ancient Greece and Rome, people used animal ashes as tooth powder to clean their mouths, and some primitive tribes used charcoal, salt water, fine sand, and branches to clean their teeth. Mash one end and make it into a brush shape, which is used to clean between teeth and brush your teeth. It is called Miswak. It is a natural toothbrush. According to scientists, this branch contains fluoride and saponin, which can prevent tooth decay and have analgesic effect. .