The first mass produced toothbrushes began to appear in the 1800s – using bristles from pigs. And by the 1880s tubes of toothpaste were available! Click here for more from Professor Hallux’s Dental Depositary! Modern dentistry is so much better t...
根据第二段前两句“The first toothbrushes were actually small twigs that people would chew on one end...were then used to clean their teeth.”可知,人们会咀嚼嫩枝的 一端以软化其纤维,然后用这些纤维来清洁牙 齿,故人们在用这些嫩枝刷牙前会先咀嚼 它们。 2.B 细节理解题。根据第三段中的“In1845,...
A. Its inventor was interested in toothbrushes. B. The toothbrush heads were too dry. C. Its inventor wanted to know whether the kids brushed their teeth. 【5】What will the Kolibree toothbrush probably be like in the future? A. The Kolibree toothbrush will be able to talk to other apps...
Until the early 1900s, toothbrush bristles were generally made of Siberian hog hair. But in 1938, the soft-bristled Miracle Tuft Toothbrush was invented. Within a decade, Oral-B was mass producing soft-bristled toothbrushes. In 1961, the electric toothbrush was introduced. Beginning in the late...
Toothbrushes have come a long way over the centuries. Since 3500 BC‚ people around the world have been using tools to clean their teeth. Egyptians and Babylonians made brushes by fraying the end of twigs. In the 15th century‚ the Chinese invented the firsttoothbrushby attaching bristles ...
A. Its inventor was interested in toothbrushes. B. The toothbrush heads were too dry. C. Its inventor wanted to know whether the kids brushed their teeth. 5.What will the Kolibree toothbrush probably be like in the future? A. The Kolibree toothbrush will be able to talk to other apps. ...
Most electric toothbrushes recharge through inductive coupling. Photo courtesy Amazon.com Unless you are particularly organized and good with tie wrap, you probably have a few dusty power cord tangles around your home. You may have even had to follow one particular cord through the seemingly...
Dishwashing tablets were invented as a convenience product to save people from measuring the detergent. We have come to think of them as a superior product. Still, they are simply a modified version of the original – a pressed powder or loose powder in a soluble membrane. ...
Who invented lithium-ion batteries? Handy, helpful lithium-ion power packs were pioneered at Oxford University in the 1970s by chemist John Goodenough and his colleagues Phil Wiseman, Koichi Mizushima, and Phil Jones. Their research was published in 1980 and turned into a commercial technology by...
(1775–1867) and it's the basic science behind an electric motor. But if we want to turn this amazing scientific discovery into a more practical bit of technology to power our electric mowers andtoothbrushes, we've got to take it a little bit further. The inventors who did that were ...