/kloc-around 0/770, William Addis was imprisoned in a British prison for inciting riots. One morning, after washing his face, he wiped his teeth with a small piece of cloth. According to legend, this method of tooth washing was put forward by Aristotle and was first used by Alexander the Great. However, Addis, who was diligent in thinking, thought that this method would not work, so he came up with a new idea: first, he drilled some small holes in a bone, then he asked the prison guard for hard bristles, cut them into small clusters, coated one end with glue and embedded them in the small holes in the bone. In this way, the first toothbrush in human history was born. \x0d\ In the Tang Dynasty, the teeth were cleaned with Chinese herbs such as Gastrodia elata, Ligusticum, Asarum, Aquilaria Resinatum and Glauber's salt, which could make the teeth fragrant and clean. Abroad, more than two thousand years ago, the ancient Romans ground pumice containing calcium carbonate and dipped it in a brush to brush their teeth. /kloc-in the middle of the 0/9th century, tooth powder with chalk as the main body appeared in the domestic and foreign markets. /kloc-tube toothpaste began to appear at the end of 0/9. Although it is more convenient to use than tooth powder, it is not refreshing. After World War II, toothpaste manufacturers made a big fuss about the taste and smell, and developed a matrix with calcium bicarbonate instead of chalk and sodium dodecyl sulfate instead of soap, which made toothpaste popular. \ x0d \ x0d \ and some others: \ x0d \ 2003 65438+ 10/9. The basement of the Austrian National Library. An ancient Egyptian papyrus with strange hieroglyphics can be traced back to 1700 years ago. The black ink made of mixed water of soot and gum has faded, but the handwriting is still legible. This papyrus paper, written in the 4th century AD, describes a "perfect powder that can make you smile and brighten your teeth". These powders are diluted by saliva and become "clean toothpaste": "1% ounces of rock salt and dried iris, 2% ounces of mint and 20 peppers (1 ounce is about 3 1 gram. \x0d\\x0d\ Since 1896, Colgate has produced the world's first extruded tube toothpaste. Up to now, brushing teeth has been gradually upgraded from an early luxury behavior to a manifestation of quality and civilization. China has a population of 654.38+0.3 billion and an annual output of nearly 4 billion toothpastes, making it the largest toothpaste producer in the world. From the international conference on the development strategy of stomatology held in June 10 this year, I learned that "in the past two decades, the awareness of oral health care in China has been continuously improved, and the basic indicator for measuring oral health-brushing rate has increased from 30% in the past to 70%", of which 85% is in cities and towns, 50% is in rural areas, and 30% is in market analysis. There are 500 million farmers in China, which means there are still 250 million farmers who need to use toothpaste. Toothpaste is a centenarian who witnessed the development of social civilization in the 20th century.