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Many years ago, people didn't know how to (1) their teeth. They used charcoal (木炭), lemon juice, ash (the stuff left over from fire) or tobacco and honey (2) together to clean their teeth! It was only about 100 years ago (3) someone(4) toothpaste to clean teeth. Most people don't know that snails (蝸牛) have teeth. But they (5) . In fact, they have around 25,600!
Rats chew to wear out their front teeth. If they lose a top tooth, the bottom tooth will grow up in its place. And it won't (6) ! It will grow right into their brain. John Massis (7) Belgium (比利時) was famous for his strong teeth. On April 4, 1974, John Massis went to New York to (8) his teeth. He bit down on a long thick rope. The rope was tied to two trains. They weighted 80 tons. He (9) the trains away for several metres with his teeth. People have used fake teeth for many years. (10) ndline, they used other people's teeth, animals' teeth, and wooden teeth! The (11) president (總統(tǒng)) of the United States, George Washington, had bad teeth. (12) he used fake ones made from animal teeth. But they hurt when he (13) ndline. And they went bad after a short time. Queen Elizabeth I of England used to have a serious tooth (14) .(15) her time, fake teeth were hard to find in England. She was always in pain. Her fake teeth were made out of porcelain (瓷), which is often used to make plates. They were difficult to eat with. |