There is a small thing we use every day. We usually put1 in the bathroom. If we don't use it, we might have tooth problems. Can you guess what it is? Yes, it's the toothbrush. But do you know2 about its history?
Before toothbrushes appeared, the ancient Chinese people3 their teeth with some small tree branches (树枝). About 800 years ago, people4 a kind of toothbrushes with pig hair and bamboo. It might be the world's earliest form of toothbrushes. As time went by, the form of toothbrushes5 . For example, people didn't use pig hair to make toothbrushes 6 it was too hard. They began to use horse-tail hair which was much softer. If I give you a7 toothbrush from hundreds of years ago and brush your teeth. . . It sounds fantastic, doesn't it?
Around the 15th century, the Chinese toothbrush found its way into Europe. It became8 among local people soon. The9 of toothbrushes was not as famous as that of paper-making, but it was very useful in daily life. Today we get into the good10 of brushing teeth. We should thank the ancient Chinese people for it.
