Most likely your gonna need a minor surgery on the toenail. In some countries they numb you down with anesthetic and remove the entire nail they just pull it after lifting it with a utensil to remove the sticky part of your toe. In America they cut a small sliver, first they pierce the underside make a small tunnel then carefully cut and then remove the piece after which they use a acidic product to burn the root so the nail regrows without being ingrown. Of course everything is under anesthesia.
The more the nail is infected the harder the anesthesia can get so make sure it's anesthetized properly.
I've suffered with ingrown toenails on but my feet since about 6 or 7 years old. Then when 18 after ending school. I had both toenail slivers removed, placed with acidic root burners then everything went back to normal. Only issue is the anesthesia did not grab on one toe as well as the other and so I had a mild painful shock which made me rock my head back in this almost passing out motion.
As for your teeth well what's your nutrition like do you eat lots of sweets do you take care of your teeth. Maybe your teeth are of a specific type like European teeth from certain Euro nations producing more cavities. It seems some white people are more susceptible towards teeth issues compared to say Blacks or Asians. Non the less have you ever categorized your teeth in which European spectrum you are?
For example I have grey teeth. My teeth are white but are Eastern European style grey range teeth. What color graduation is your teeth ever had the Dentist perform an examination on you?