There is always some exceptional circumstances where olive oil may not be recommended however as a general rule we would say yes. If you can use oil 1-2 times per day for 2-3 days prior to the appointment you will help in softening the ear wax to make it easier to clean. Some people stop using olive oil when it results in their hearing getting worse however that is usually a sign of progress. When the wax soaks up the oil it can expand and move around causing a blockage and therefore a temporary hearing loss. However it is a necessary step for preparation before an appointment.