Inclusion Criteria:  Persons who have been diagnosed with dementia by their physicians and in nursing homes in Selangor, Malaysia. Persons with dementia who have at least one symptom of BPSD  Exclusion Criteria:  Persons with dementia with a comorbid respiratory problem like asthma or chronic obstructive pulmonary disease Persons with dementia who are allergic to fragrance/perfumes Persons with dementia who had a change in their psychotropic or dementia medications in the 30 days before commencement of the study, namely: acetylcholinesterase inhibitors N-methyl-D-aspartate (NMDA)-receptor antagonist (memantine), antipsychotics, antidepressants, sedatives, or medications with anticholinergic properties Persons who have been diagnosed with schizophrenia or mental retardation Persons who have no documented behavioral history in the previous three month Persons who are currently hospitalized Persons with dementia who are unwilling to participate or disallowed by caregivers/family members