How long for Infraorbital nerve damage to heal following 0.5ml of HA filler in cheek 10 months ago?

I perform many facial fracture repairs per year for various forms of trauma.  My patients that experience transient infraorbital nerve damage during their injury usually recover within 12-18 months.  Occasionally, some have longer revery; however, most get full recovery.  Nerves just take time to heal.

Sorry to hear about this injury. The good news is that it most assuredly will go away if the injury was only filler related. Bleeding at the nerve or direct trauma from the needle or compression from placing HA into the opening the nerve comes out of are the likely causes.  Some studies show that nerves grow about a millimeter a month, so patience is in order as it could take another year to settle down to normal function.