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智齿，是没有跟上人类进步的存在？
source link: https://tech.sina.com.cn/d/f/2019-07-07/doc-ihytcitm0241166.shtml
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来源：科学大院教学过程中，偶尔会有学生问我：“牙齿算不算骨骼？”虽然学生们直觉上认为牙齿应该不算是骨骼，但可能由于其与骨骼一样质地坚硬，形状也类似，所以经常混淆。准确地说，牙齿并不是骨骼。骨骼在折断之后能够重新生长并自然愈合，但牙齿只长一次
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