Permanent only if you follow instructions from "doctors" for methods of treating it, if they offer any at all. Most will just throw some pharmaceuticals at you that will not help, or even make it worse. However, there are things you can do to heal and restore your sense of smell (and taste) somewhat back to normal over time. You essentially need to heal the nerve endings/epithelium and retrain your sense of smell with countering scents juxtaposed with tasting specific foods and spices. Some studies are showing that a routine of intranasal vitamin A drops could help with the healing. Might be worth it for you to look into that. I know several who are still uninjected and who had gotten this modified flu early on (likely firsthand from 'seasonal flu vaccine' administering and not via proximity to someone with it) and who had lost their sense of smell from it. Years later now and both still are uninjected, but both still have either no smell or only a slight sense of smell. This total or near total lack of smell also causes no or only a slight sense of taste. Things that were once tasty to them have been revolting in flavor. One who doesn't smoke even noted that they regularly get a strong whiff of cigarette smoke even in their own smoke-free home due to the misfiring of the damaged nerves. Sadly, no information I have that I could share with them on this or any other topic is of any value to them and dismissed outright. That's family for you. Their loss.