Why are wisdom teeth called 親知らず in Japanese? Why are wisdom teeth called {} in Japanese? The literal meaning seems to be something like "unknown to the parents".

From the wikipedia article:

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Translation (please edit where appropriate):

> In contrast to baby teeth, wisdom teeth often start to grow in after you become independent of your parents. Therefore, your parents do not know about them. This is the reason they are called . Also, if you think of baby teeth as the "parents" of permanent teeth, do not have corresponding baby teeth, as a result, some people claim that means teeth which do not have corresponding baby teeth.