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  3. A lot happens to your teeth. They are ground, braced, brushed, flossed, polished, drilled, filled, and if you do not take care o

A lot happens to your teeth. They are ground, braced, brushed, flossed, polished, drilled, filled, and if you do not take care o

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问题     A lot happens to your teeth. They are ground, braced, brushed, flossed, polished, drilled, filled, and if you do not take care of them, pulled. For your teeth, proper oral care is as essential as anything else you do for your body and your generally health. Fortunately, if there is any damage to your teeth modern dentistry techniques make it easier, faster and less painful to get the problem fixed.
    By definition, dentistry includes the study, diagnosis, treatment and the prevention of disease of the mouth, teeth, gum and jawbones. Today’s dentists use sophisticated equipment and pain-preventing medicines, but these have not always been around.
    The earliest historical records of dentistry are from Egypt from around 3600 B.C. Aesculapius, a Greek physician who lived around 1250 BC, is credited with the idea of pulling disease teeth. Hippocrates, around 400 BC, wrote of applying ointments and using branding irons to treat disease of the mouth. Through the Middle Ages wealthy people were treated by physicians and surgeons, while poor people could look to the local barber to pull painful teeth.
    Modern dentistry emerged with the release of Pierre Fauchard’s book The Surgeon Dentist, A Treatise on Teeth. Fauchard is considered the father of modern dentistry. Later, the first school devoted to teaching dentistry opened in Baltimore in the U.S.A. in 1840.
    Green Vardiman Black invented a foot engine so dentists would have two free hands while using the dental drill. He also came up with the idea that gum disease was an infection caused by bacteria. This was later confirmed in 1960. An important contribution was made in 1944 when Dr. Horace Wells, a Connecticut dentist, first used nitrous oxide (laughing gas) as an oral anesthetic; today this method of administering anesthetic is employed for many dental and medical surgeries. The introduction of fluoride in toothpaste in the 1960s was a huge breakthrough; teenagers and adults today have a 50% better chance of not developing tooth decay.
    The 1990s saw a change in thinking when it came to fillings for cavities in teeth. Since the early 1800s silver amalgam—a combination of silver, tin and mercury—has been the standard filling compound. But modern fears about mercury poisoning have led many people to have their amalgam fillings replaced with plastic polymer fillings. Besides not having any mercury, plastic polymers have an advantage over metal fillings because the color can be matched to the surroundings tooth and the material can be chemically bonded to the tooth.
    Dentistry methods are sure to advance even more in the future. Things such as laser technology, which is used to eliminate diseased tissue or weld together damaged parts of teeth, will soon become a common practice in dentists’ offices. And computer-assisted technology is ushering in new advances in the area of tooth restoration. The primary goal of dentists is to develop early detection methods to prevent dental conditions from turning into dental problems.
    Caring for your teeth properly will lessen the number of visits you make to the dentist. Brushing properly, flossing every day, getting a professionally cleaning every six months and maintaining a diet low in sugar can aid in keeping your teeth healthy. Your teeth will stay in your mouth if you take care of them.
选项 A、Proper dental hygiene.
B、Major events in the history of dentistry.
C、Great people who have been dentists.
D、Dentistry methods.
答案B
解析
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