Infraorbital nerve damage 6 years ago. What can I do about this?

Hello! I've sustained a minimally displaced anterior maxillary sinus wall fracture in November 2016 with involvement of the infraorbital canal / foramen. 2 days after the incidence, my face became numb (left side of upper teeth and gingiva, upper lip, skin between the eye and nose). This has regressed from an anesthesia to a hypoesthesia but it's still there. When brushing teeth or moving my face it Tingles in my face. What can I do about this? Surgeons tell me not to operate... Thanks!