Is wisdom tooth the "back tooth" as the saying goes?

No, the back teeth in Sichuan dialect mean that when you change your teeth, your front teeth won't fall out, which looks like the front teeth "back" the back teeth. The most common is when changing teeth.

Wisdom teeth are teeth that come out around the age of 18 to 20. When they grow out, you don't need to replace other teeth.

Whether it can be pulled out depends on its specific situation. Not all wisdom teeth need to be pulled out.