I wouldn't necessarily say ever.
Decades ago I had a radiation exposure and lost my sense of taste and smell for a while (almost a year) and it returned.
That being said, you need to see an attorney. Even if you don't have this boyfriend arrested he is still financially liable for his actions. You have a civil tort action.
Hi
Welcome to the MedHelp forum!
Well, the blow has to be sufficiently severe to cause such an extensive damage to olfactory and lingual nerves. Usually these nerves are damaged due to a blow on the face. It is difficult to comment on net. Generally post injury if the nerves are in shock, then after initial numbness, there will be recovery. However, if the damage is permanent, then there will be no recovery.
But since you had a scan, take another neurologist’s opinion.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!