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. 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 push sideways through the gums(牙床). An impacted wisdom tooth is one that fails to completely rise through the gum-the term is erupt. Wisdom teeth that only partially erupt can leave space for bacteria to enter around the tooth. Infection is a risk in these cases. Wisdom teeth’that are not well in place and become impacted are often removed. People should have the placement of their wisdom teeth examined between the ages of sixteen and twenty. X-rays can show wisdom teeth that are below the gums. The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums. Removal is also advised if there is a chance that poorly placed wisdom teeth will damage other teeth. And removal is called for in cases where fluid collects around a wisdom tooth that is partly or fully below the gum. 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 prehistoric 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. The American Association of Oral and Maxillofacial (上颌面的) Surgeons says young adults are the best candidates for wisdom teeth removal. The group says older patients may be at greater risk for disease in the tissue surrounding the teeth. After surgery, there can be swelling of the gums and face and some pain. Both can be treated with cold wraps and medication(药物治疗).Wisdom teeth will cause problem when (). A. they are below the gums B. they have erupted from the gums C. they don’t have place to grow normally D. people are at their late teens or early twenties
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. 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 push sideways through the gums(牙床). An impacted wisdom tooth is one that fails to completely rise through the gum-the term is erupt. Wisdom teeth that only partially erupt can leave space for bacteria to enter around the tooth. Infection is a risk in these cases. Wisdom teeth’that are not well in place and become impacted are often removed. People should have the placement of their wisdom teeth examined between the ages of sixteen and twenty. X-rays can show wisdom teeth that are below the gums. The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums. Removal is also advised if there is a chance that poorly placed wisdom teeth will damage other teeth. And removal is called for in cases where fluid collects around a wisdom tooth that is partly or fully below the gum. 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 prehistoric 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. The American Association of Oral and Maxillofacial (上颌面的) Surgeons says young adults are the best candidates for wisdom teeth removal. The group says older patients may be at greater risk for disease in the tissue surrounding the teeth. After surgery, there can be swelling of the gums and face and some pain. Both can be treated with cold wraps and medication(药物治疗).Wisdom teeth will cause problem when (). A. they are below the gums B. they have erupted from the gums C. they don’t have place to grow normally D. people are at their late teens or early twenties
题目解答
答案
C
解析
智慧牙是最后长出的牙齿，通常在青少年晚期或二十岁初期出现。它们是位于口腔后部的咀嚼牙齿。如果口腔有足够的空间，它们可以正常生长，不会造成问题。然而，如果空间不足，它们可能会挤压其他牙齿，甚至侧向生长。当智慧牙未能完全长出时，称为阻生智齿。部分长出的智慧牙可能会留下细菌进入的空间，从而导致感染风险。
步骤 2：分析问题核心
问题核心在于智慧牙何时会引发问题。根据文章，智慧牙引发问题的情况包括：没有足够的空间正常生长、挤压其他牙齿、部分长出导致感染风险、以及完全或部分位于牙龈下方时液体积聚。
步骤 3：确定正确答案
根据文章内容，智慧牙引发问题的情况是它们没有足够的空间正常生长。因此，正确答案是C选项。