Wisdom teeth are normally the last teeth to appear in the mouth. It usually happens when people are older and wiser. That is, when they are in their late teenage years or early twenties.

    Wisdom teeth are molars, or chewing teeth at the back of the mouth. The third set of molars, 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 the other teeth. Sometimes they even push through the gums sideways.

    An impacted wisdom tooth is one that fails to completely rise through the gums -- the term is erupt. Wisdom teeth that only partly erupt can leave space for bacteria to enter around the tooth. Infection is a risk in these cases.

    Experts say people should have their mouths examined between the ages of sixteen and twenty for placement of their wisdom teeth. X-rays can show wisdom teeth below the gums. Those that are not well aligned and become impacted are often removed.

    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 aligned 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 removal of wisdom teeth is performed by oral surgeons. They say if removal is advised, the best time to do it is before the teeth cause any problems or pain.

    The American Association of Oral and Maxillofacial 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 molars.

    Patients can have general anesthesia during the operation. Or they might 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 surgery, there can be swelling of the gums and face and some pain. Both can be treated with cold wraps and medication. 

    智齒通常是最后長(zhǎng)出的牙齒。人們?cè)谇嗌倌晖砥诨?0歲出頭的年歲最容易長(zhǎng)智齒,這時(shí)候人的年紀(jì)大了,也更有智慧,所以稱(chēng)之為智齒。

    智齒屬于臼齒,長(zhǎng)在口腔后側(cè)用來(lái)磨碎食物。通常口腔內(nèi)沒(méi)有足夠的適于智齒生長(zhǎng)的空間,因此他們常常會(huì)擠撞其他牙齒。有時(shí)甚至?xí)��?cè)面頂著牙齦生長(zhǎng)。

    無(wú)法長(zhǎng)出或萌出的智齒稱(chēng)為阻生牙。僅有部分萌出的智齒周?chē)�容易產(chǎn)生細(xì)菌感染。

    專(zhuān)家建議人們應(yīng)在16-20歲之間檢查智齒生長(zhǎng)的位置。X光可以清楚地顯示牙齦下智齒的情況,咬合不均衡或會(huì)成為阻生牙的多會(huì)被拔除。

    美國(guó)牙醫(yī)學(xué)會(huì)建議出現(xiàn)以下情況時(shí)將智齒拔掉:智齒無(wú)法完全萌出牙床時(shí);咬合不均衡的智齒有可能侵犯鄰牙時(shí);流質(zhì)食物殘?jiān)�堆積堆積在部分或全部位于牙床以下的智齒時(shí)。

    既然我們需要拔掉智齒,為什么還會(huì)長(zhǎng)智齒呢?一個(gè)理論認(rèn)為這與人類(lèi)的飲食有關(guān)�？茖W(xué)家們介紹,遠(yuǎn)古時(shí)代,食物比較粗糙,人們需要更多的咀嚼類(lèi)牙齒來(lái)幫助磨碎食物。

    智齒拔除手術(shù)由牙醫(yī)們完成。他們認(rèn)為最好選擇智齒尚未引起任何疼痛和問(wèn)題的時(shí)候進(jìn)行手術(shù)。

    美國(guó)口腔頜面外科醫(yī)師協(xié)會(huì)表示應(yīng)盡量選擇年輕時(shí)進(jìn)行手術(shù),年紀(jì)越大,引發(fā)臼齒周?chē)�組織感染的幾率越大。

    手術(shù)時(shí)可以選擇全身麻醉,或者吃止痛藥,保持清醒。這取決于智齒的情況以及要移除的數(shù)量。

    手術(shù)后牙床和臉部會(huì)腫脹,并伴有疼痛�？墒褂美涿�巾或吃消炎藥。