Smell training is a process designed to help individuals regain or enhance their sense of smell. It typically involves regularly exposing oneself to a set of distinct scents, often using essential oils or common household items. This practice can be beneficial for those who have experienced a loss of smell due to conditions like COVID-19, allergies, or other health issues. The training usually consists of sniffing four specific scents, such as rose, lemon, clove, and eucalyptus, twice a day for several weeks. By consistently practicing this technique, individuals may improve their olfactory function and overall quality of life.