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I believe I've answered your previous question regarding your wisdom tooth extraction issue. If so, this is redundant, but here you go :
It is common for numbness to persist following wisdom tooth extraction for 12 hours or perhaps more. However, if you are still experiencing numbness four days after the procedure, you may be experiencing an issue known as "paresthesia". This is an issue where the nerve that had been anesthetized by your oral surgeon is recovering from the injection(s). This can take a long period to heal, unfortunately. While, typically, the nerve gradually and continually regains sensory function, it can take up to six months or more to completely return to normalcy. Sometimes steroids are used to accelerate the healing process, as nerves heal very slowly relative to other body tissues. I would recommend notifying your oral surgeon of your symptoms. He or she will likely suggest specific treatment based on direct knowledge of your extractions and relevant xrays.
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