Hi.. Can understand your concern.. As per your complain it is true that the roots of wisdom tooth lies in close contact with the Inferior dental nerve which is the nerve that supplies the lower jaw on either side.. During the extraction of the wisdom tooth it is very much possible that the inferior dental nerve gets damaged leading to paresthesia of the nerve or there can be complete breakage of nerve leading to complete numbness.. In case if you have a decayed wisdom tooth you can consult an ENDODONTIST who is a specialist in root canal treatment and can take an x ray and evalate the condition of your tooth and if possible can do a root canal treatment as it is not contraindicated to get a wisdom tooth root canal done.. In case if the root canal cannot be done you need to consult an Oral Surgeon who can evaluate the closeness of the nerve to the root of the tooth and can perform the extraction cautiously by cutting the bone around the tooth as well as split the tooth into parts to extract the tooth without damaging the nerve.... Hope this information helps.. If you find the answer helpful please write a positive review and click on find this answer helpful as a token of appreciation.. Thanks and regards.. Dr.Honey Nandwani Arora.