In brief: Wrong question. If you received a local anesthetic for extraction of wisdom teeth, you will be numb for 1-2 hours afterwards. General anesthesia (going to sleep) is also administered in come cases of wisdom tooth extractions but usually does not cause numbness of any part of the body.
In 1876, Charles Hires first sold commercial root beer to the public.
In the case of root beer, the flavoring comes from the root of the sassafras tree or the sarsaparilla vine. Originally, the root was brewed like a tea to make an extract, but now it is much easier to buy the extract ready-made. The root beer extract is mixed with sugar, yeast and water.