Third molar teeth (commonly referred to as wisdom teeth) consist of the mandibular and maxillary third molars; they usually appear between the ages of 17 and 25. They are called wisdom teeth because usually they come in when a person is between age 17 and 25 or older—old enough to have supposedly gained some wisdom.
Wisdom teeth are commonly extracted when they affect other teeth—this impaction is colloquially known as "coming in sideways."Most adults have four wisdom teeth, but it is possible to have more or fewer. Absence of one or more wisdom teeth is an example of hypodontia. Any extra teeth are referred to as supernumerary teeth. 1。出生时母亲还年轻。美国芝加哥大学科学家研究发现,一个人出生时母亲年龄如果不到25岁,他们活到100岁的几率是出生时母亲超过25岁的人的两倍。 >>> I actually know some people believe in long living. Chinese believe in that in general. Yet, I never want to live long. When I was in elementry school, I only want to live to 40years old. (heh) Now, it could be longer, maybe 60? Funny thing, I did a test online another date. The result tells I am going to live to 93years old. haha, that sounds very scary to me. Humans are civilizing, and living longer and longer. In my opinion, the length of life doesn't matter. The quality of life matters. I always believe quality is more important than quantity. If you choose to live long, you better enjoy your life time the most. |