首页
登录
职称英语
The development of toothpaste began as long ago as 3000/5000 BC in the ancien
The development of toothpaste began as long ago as 3000/5000 BC in the ancien
游客
2023-12-17
54
管理
问题
The development of toothpaste began as long ago as 3000/5000 BC in the ancient countries of China and India. According to Chinese history, Huang-Ti claimed different types of pain felt in the mouth could be cured by sticking gold and silver needles into different parts of the jaw and gum. h was theories such as these that led to the development of dental cream. During the years 3000/5000 BC, Egyptians made toothpaste using a recipe of powdered ashes of hooves of oxen, myrrh, powdered and burned eggshells and pumice. It is assumed that the ancient Egyptians used their fingers to rub the mixture onto teeth.
The tooth stick, the forerunner of the toothbrush, had not, as far as is known, been discovered at this time. From the records of the ancient countries of India, China and Egypt, it was the Greeks and Romans who developed and improved toothpaste and developed a leaden instrument for the extraction of teeth. They were also the first to bind loose teeth together and to support artificial teeth by means of gold wire. During 1000 AD, the Persians gave advice on the dangers of using hard toothpowders and recommendations were made to make toothpowder from burnt hartshorn, the burnt shells of snails and oysters and burned gypsum. Other Persian recipes included dried animal parts, herbs, honey and minerals. One formula for strengthening teeth included green lead, verdigris, incense, honey and powdered flint stone.
Toothpowder or dentifrice was first available in Britain in the late 18th century. It came in a ceramic pot and was available either as a powder or paste. The rich applied it with brushes and the poor with their fingers. The powders were developed by doctors, dentists and chemists and often contained ingredients that were highly abrasive and harmful to the teeth, such as brick dust, china, earthenware or cuttlefish, and to make them more palatable, they contained glycerine. By the early nineteenth century, the ingredient stronchium was introduced, to strengthen teeth and reduce sensitivity, but it only really concentrated on the gums. In the late 18th century, borax powder was used to get the foaming effect. In 1873, an aromatic toothpaste in a jar was introduced in the U.S. and in 1896, Dental Cream was first packaged in collapsible tubes. Before the Second World War, the majority of toothpaste on the market used soap as an emulsifying agent, even though it was known that soap had certain inherent defects. [br] What is the main subject of the passage?
选项
A、Methods of cleaning teeth.
B、Methods of caring for teeth.
C、Development of toothpaste.
D、Dental history.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3282146.html
相关试题推荐
Aseveryancientmarinerknew,travelingbysailisasimplewaytogo.Thoug
Aseveryancientmarinerknew,travelingbysailisasimplewaytogo.Thoug
Asyouknow,sciencehashadgreateffectonourlivessincetheancienttim
Withtherapiddevelopmentofoureconomy,thepastdecadehaswitnessedaremar
Storytellingisanancientandhonoredart.Storytellersentertainedduring
Storytellingisanancientandhonoredart.Storytellersentertainedduring
1Duringtheadolescence,thedevelopmentofpoliticalideologybecomesap
1Duringtheadolescence,thedevelopmentofpoliticalideologybecomesap
1Duringtheadolescence,thedevelopmentofpoliticalideologybecomesap
TheStatusofWomeninAncientSocietyInlargepa
随机试题
Inourthinkingactivities,suppositionalconceptexistsasthecontraryofreal
()是企业文化的内容之一,是对企业存在和发展的一种深层次定位,是企业价值观和
烟花爆竹的组成决定了它具有燃烧和爆炸的特性。燃烧是可燃物质发生强烈的氧化还原反应
隧道通风应符合的要求有( )。A.双向交通的隧道设计风速不应大于8m/s B
下列各项,属脾主运化生理功能的是( )。A.腐熟水谷 B.统摄血液 C.运
下列各项,不属《希波克托底誓言》内容的是A.为病家渫利益 B.强调医学址艺术
在Ⅰ型超敏反应中发挥重要作用的抗体类型是A.IgG B.IgA C.IgM
符合毛细胞白血病的特点为A.多见于女性B.白血病细胞表面有免疫球蛋白C.全身性淋
负责我国药品标准制定和修订的是A.国家质量技术监督部门 B.省级以上药品检验机
关于厂区总平面布置技术经济指标的说法,正确的是()A:工业企业内部绿地率应不低于
最新回复
(
0
)