【正确答案】 D

【答案解析】[解析] 11-13
Wisdom teeth are normally the last teeth to appear. This usually happens when people are in their late teen years or early twenties—in other words, when they are older and wiser.
Wisdom teeth are chewing teeth, at the back of the mouth. The third set of chewing teeth, if you have them, are your wisdom teeth.
They can grow into place normally and never cause a problem. But often there is not enough room for them in the mouth. They might crowd other teeth. Sometimes they even grow sideways. Sometimes they fail to completely grow out and thus leave space for bacteria to enter around the teeth. These wisdom teeth are often removed.
But why do we have wisdom teeth if we often need to get them removed? One theory has to do with our diets. Scientists say the diet of ancient humans probably required more chewing teeth. Life was probably a little rougher on the teeth back then, too. So it was good to have extras.
Doctors say if removal is advised, the best time to do it is before the teeth cause any problems or pain.
Experts say young adults are the best candidates for wisdom teeth removal. They say that older patients may be at greater risk for disease in the tissue surrounding the chewing teeth.
Patients can choose to have a local painkiller and remain awake. It may depend on the condition of the wisdom teeth and the number to be removed.
After the surgery, there can be swelling of the gums and face and some pain. Both can be treated with cold wraps and medication.