"The mainstay of treatment for post-COVID smell loss is olfactory training — a procedure that many rhinologists compare to physical therapy for the nose. Individuals are instructed to sniff a sequence of four essential oils, deeply inhaling each one for 15 seconds while concentrating on their memory of the corresponding smell. They repeat the procedure twice a day over the course of months.
Olfactory training has its roots in the established understanding that the sense of smell is mutable and improvable. For example, people in professions that involve smell — sommeliers, perfumers, tea merchants and chefs — often develop keen noses, says Thomas Hummel, an olfaction researcher at the Technical University of Dresden in Germany, who conducted some of the first studies of the procedure in the 2000s." [1]
1. Nature 606, S7-S9 (2022)
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