One of the unique symptoms of the SARS-CoV-2 disease, COVID-19, is the loss of chemical senses, i.e., smell and taste. Smell training is one of the methods used in facilitating recovery of the olfactory sense, and it uses essential oils of lemon, rose, clove, and eucalyptus.
One type of treatment that has shown promise is smell retraining therapy. It involves exposing the patient to different strong scents for several minutes at a time for three months. “It is a simple concept, but has shown evidence of significantly improving smell over time.