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智齿也就是所谓的第三大臼齿，随著人类演化过程，第三大臼齿可磨碎食物的功能，几乎可以被第二大臼齿取代。至于为什么会被称为智齿呢？

由于大部分发智齿的年龄大约是在16岁以后，这个时候我们的身心灵已达到一定的成熟阶段，因此被也认为是智慧来了的象征！不过没长出来也不代表智慧未开，也有很多人是到了40-50岁才长智齿，甚至有些人是一辈子都没有长智齿，这些都是属于正常的现象！

基本上，牙医会先透过X光确认智齿的生长情况并评估需不需要拔除，通常有两种情况需要拔除智齿：

1.阻生智齿

智齿受其他牙齿或空间影响而未能正常萌发，而阻生智齿又有不同的生长方式，常见的包含垂直、水平、倾斜等，阻生智齿除了容易造成发炎、影响原有的齿列排序，也容易产生间隙使食物残渣不易清除，不仅是智齿本身容易蛀牙，连带邻近牙齿也会有蛀牙的风险！

2. 清洁受阻

长正的牙齿，也有可能因为过于拥挤而不易清洁，导致周围的牙齿容易蛀牙而有牙龈肿痛、口臭的问题发生。

医生建议，应和医生评估并充分讨论后，若决定要拔除智齿，也别忘了特别注意手术后的清洁与伤口照护。