* Causes of olfactory dysfunction can be classified into conductive and sensorineural causes. * Conductive causes are mainly due to structural nasal problem, which can be treated by nasal surgery * Sensorineural causes included post-infection, post-head injury, post Head and Neck irradiation and other central nervous system diseases. * Olfactory Training is well established treatment for sensorineural olfactory dysfunction in foreign countries. * Olfactory Training by neurological chemosensory stimulation using aromatic substances delivered via electronic portable aromatic rehabilitation (EPAR) diffuser was proved to be effective treatment in COVID-19 related olfactory dysfunction in recent Hong Kong study. * However, there is a lack of local study on the effect of Olfactory Training in other non-COVID-19 sensorineural causes of olfactory dysfunction in Hong Kong population.
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Olfactory threshold changes after olfactory training after 3 months
Timeframe: 3 months after starting smell training
Olfactory identification score changes after olfactory training after 3 months
Timeframe: 3 months after starting smell training
Quality of life changes after olfactory training after 3 months
Timeframe: 3 months after starting smell training
Taste and smell changes after olfactory training after 3 months
Timeframe: 3 months after starting smell training