有关牙齿的英语资料 牙齿的英语。
You bite into an apple and then try to start talking to your friend about yesterday's math homework. Suddenly something feels funny - one of your baby teeth has fallen out! It's been loose forever, and now there it is, right in your hand. And you have an empty space in your mouth big enough to poke a drinking straw through.
Before you put that tooth under your pillow, did you know that there is much more to that tooth than meets the eye? A single tooth has many different parts that make it work. And teeth play an important role in your daily life. They not only let you eat stuff like apples, they also help you talk. So let's talk teeth!
Tiny Teeth
Unlike your heart or brain, your teeth weren't there ready to work from the day you were born. Although babies have the beginnings of their first teeth even before they are born, teeth don't become visible until babies are about 6 or 7 months old.
After that first tooth breaks through, more and more teeth begin to appear. Most kids have their first set of teeth by the time they are 3 years old. These are called the primary or baby teeth, and there are 20 in all. When a child grows to age 5 or 6, these teeth start falling out, one by one.
A primary tooth falls out because it is being pushed out of the way by a permanent tooth that is behind it. Slowly, the permanent teeth grow in and take the place of the primary teeth. By about age 14, most kids have lost all of their baby teeth and have a full set of permanent teeth.
There are 28 permanent teeth in all - eight more than the original set of baby teeth. About around age 20, four more teeth called wisdom teeth usually grow in at the back of the mouth. They complete the adult set of 32 teeth.
Tooth Tour
Let's take a tour of your teeth. Look in the mirror at your own teeth or check out a friend's smile. The part of the tooth you can see above the gum (your gums are the pink, fleshy part beneath your teeth) is called the crown. The crown of each tooth is covered with enamel (say: ih-nah-mul), which is very hard and often shiny. Enamel is a very tough substance and it acts as a tooth's personal bodyguard. Enamel works as a barrier, protecting the inside parts of the tooth.
If you were able to peel away the enamel, you would find dentin (say: den-tin). Dentin makes up the largest part of the tooth and is similar to bone. Although it is not as tough as enamel, it is also very hard.
Dentin protects the innermost part of the tooth, called the pulp. The pulp is where each tooth's nerve endings are found. When you eat very hot soup, suck on a super-cold popsicle, or fall and hurt your teeth, it's your pulp that hurts. The nerve endings inside the pulp send messages to the brain about what's going on, like "That Popsicle is too cold!" The pulp also contains the tooth's blood vessels, which feed the tooth and keep it alive and healthy.
Both the dentin and the pulp go all the way down into the root of the tooth, which is under the gum. Cementum (say: sih-men-tum), which is like your body's glue, holds the root of each tooth to your jawbone.
Something to sink your teeth into
Mark Dery recently underwent dental surgery and extracted a thought-provoking rant from the experience about a possible subconscious fear of teeth:
"Certainly, the mouth, as the biggest breach in the body's integrity, holds its own terrors (What's this big hole in the middle of my face?! What if something falls out? What if something falls in?). Not for nothing has the face of mythic horror been a slavering maw (Alien), a toothy portal welcoming you to the afterworld (Jaws).
Teeth are scarier still. TV dramas such as CSI: Crime Scene Investigation and police-procedural fiction such as Patricia Cornwell's novels about the forensic pathologist Kay Scarpetta have forged an ubreakable link, in the mass imagination, between teeth and death. In such narratives, teeth and dental records are often all that remain of the murdered; mute witnesses to their owner's last moments, they testify to the victim's identity and, ultimately, help finger the perp.
Teeth are by definition uncanny, the point at which the skull beneath the skin erupts through the body's surface. It's the Return of the Repressed (© Sigmund Freud; all rights reserved)—in this case, the death we do our best to forget while we're busy living. A bony reminder that mortality is the subtext lurking just beneath the human comedy, teeth are the skeleton's insistence that it, too, is ready for its close-up."
关于保护牙齿的 英语短文~
同学们要保护好自己的牙齿，要做到以下几点：
Students to protect their teeth, it is necessary to do the following:
1．要养成良好的刷牙习惯。饭后用温开水漱口，早晚各刷牙一次。刷牙的次数不能太多，多了反而会损伤牙齿，刷牙的时间也不宜过长。刷牙要注意正确的方法：顺着牙，竖着刷，刷完里面再刷外面。不可横向来回用力刷，否则会损伤牙龈。
1. To develop good brushing habits. Gargle with warm water after a meal, brush your teeth once each morning and evening. The frequency of brushing is not too much more it will damage teeth, brush your teeth should not be too long a time. Attention should be paid to brushing their teeth the right way: down the teeth, brush vertical,brush outside good brush inside. Lateral force can not brush back and forth, otherwise they will damage gums.
2．平时要注意牙齿卫生，保护好牙齿。平时要少吃糖果。尤其是临睡前不要吃糖，预防龋齿。此外，要注意平时的卫生习惯，不咬手指头，不咬铅笔头等异物，不用舌头舐牙齿。
2. Usually pay attention to dental health, and protect teeth. Usual to eat less candy. In particular, it is not candy bedtime to prevent dental caries. In addition, attention should be paid to health habits usually do not bite finger, do not bite a pencil top foreign body, the teeth do not lick the tongue.
tooth，复数teeth
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