70 year-old healthy male.  I have insensitive teeth, my dentist can drill to his hearts content without injecting anesthesia.  Dentist calls it nerve withdrawal but cant put a medical name on it.. I also have bilateral numbness on the plantar surface of my feet.  Thought they might be related.
Hello read through your query. Insensitive tooth is nothing but the tooth which has lost its life(tooth with necroses pulp). Nothing to be worried in this case. You can go to an endodontist and get it filled by RootCanalTreatment procedure(if it's causing any pain or problems to you). If it's not showing any symptoms like pain be cool and enjoy eating. This insensitive tooth may be caused due to some trauma years back or due to any caries in the tooth which has gone deep into the pulp and killed the pulp. In my view it has nothing to do with your bilateral numbness of feet as you have insensitivity to a tooth. If it causes insensitivity to all tooth then we can suspect bilateral numbness can do something with this and go for investigation for that. So for now be cool to enjoy your life. Best part of your life. Stressfree and happy mind lets you stay fit year after year. Hope you have benefitted something with this reply. Have a Healthy day!!!