Dentists are specially trained to be experts and have to study for as many as eight years before they can treat patients on their own. And with modern technology and more »
Incredibly, the miswak is still in use today in some parts of Africa, the Middle East and Southeast Asia. Over the centuries, it's outlived some briefly-experimented-with toothbrush form factors like these: Toothbrushes at the National Museum of Dentistry include, from left to right: A misw...
I guess when you think about ways people cleaned their teeth before toothbrushes were invented, you might not want to live without your toothbrush,either. Would you want to chew (口且嚼)on a stick or bird feather(羽毛)?How about cleaning your teeth with a stick and salt? We can thank W...
Recent data show comparable deficits in oral cleanliness after tooth brushing in habitual users of powered toothbrushes (PT) and manual toothbrushes (MT). The present analysis explores the origin of these deficits by relating aspects of the observed toot
Reporters try to speak to as many people as possible. They also use pictures and numbers to show the readers that the stories are true. The newspaper Teenagers has lots of news stories on the news page and front page. When we read them, we learn more about the facts, not the writers...
But in many cases, it did at least sort of keep these towns bumping along. And now when they close, even the people who’ve never worked in the prisons are going to be harmed. Because in some cases this means that utilities won’t be able to be provided. There are some towns that...
( ) 2. Which of these didn't people use to clean their teeth before toothbrushes were invented? A. The bone. B. The stick. C. The salt. D. The feather. ( ) 3. What does the underlined word "mass-produced" mean? A. Made a collection of many things. B. Made a large number...
The world's forests are getting drier and people are living closer to them, ushering in a dangerous new era—unless we can find a way to coexist with the flames.
15. Where did the woman go last week? A. To the museum. B. To the countryside. C. To the cinema. 16. Why does the woman want to see Journey to the West? A. Because she has watched the TV play. B. Because she is interested in Chinese culture. ...
Avoid the bully and when you can, use the buddy system. Ever heard of, "power in numbers"? Don't Let Them See You Crack Aly/Canva Don't Let Them See You Crack It's what the bully wants, to see that they got under your skin. Keep it together. You can do it. ...