Olfactory Training As a Treatment for Olfactory Dysfunction Post COVID-19

This study tests an olfactory training (smell retraining) program for people who lost their sense of smell after COVID-19 and have not recovered. Olfactory training involves regularly smelling specific scents to help retrain the brain's smell pathways. This intervention is done online, making it accessible from home. You may be eligible if: - You tested positive for COVID-19 and still have ongoing smell problems (reduced or absent smell) - You are willing to give written informed consent - You understand and can read French - You have internet access and a working email address You may NOT be eligible if: - You had problems with your sense of smell before getting COVID-19 - You have chronic sinusitis (with or without nasal polyps) - You have received radiotherapy or chemotherapy for a head and neck tumor - You have Alzheimer's disease, Parkinson's disease, multiple sclerosis, or another neurodegenerative disease - You have a brain tumor or ENT diagnosis - You have had nasal or sinus surgery - You have a history of traumatic brain injury Talk to your doctor to see if this trial is right for you.