Smell training is a process designed to help individuals regain or enhance their sense of smell. It typically involves regularly sniffing a set of specific scents, such as rose, lemon, clove, and eucalyptus, to stimulate the olfactory system. This practice can be beneficial for those who have experienced a loss of smell due to conditions like COVID-19 or other illnesses. The training usually lasts for several weeks and requires consistency. Participants are encouraged to focus on each scent for about 20 seconds, allowing their brain to recognize and remember the smells. Over time, this can improve their ability to identify and differentiate various odors.