lmaooooo ok now that I've gotten that outta the way, well aren't u in luck because I'm actually a dental assistant and NO no one will test your blood for anything especially marijuana. Wisdom tooth extractions are very normal, common procedure in dental offices its not that big of a deal at all to test ur blood for anything. Now I've never actually worked for an oral surgeon but I have assisted during oral surgery at general practices and the dentists never kept or tested anyones blood. Ever. I hope this answered ur question and relieved ur fear