Thrush is a disease caused by the infection of oral mucosa by Candida albicans. Depending on the age of onset of thrush, different departments should be chosen for treatment. If the disease occurs in the newborn period, the neonatology outpatient clinic should be visited. If the child is over one month old, they can be seen at the dental clinic or the pediatric outpatient clinic during normal working hours. During non-working hours, such as noon, evening, weekends, and holidays, the pediatric emergency department should be consulted. Of course, some cases of thrush occur because the individual has an underlying disease, including immunodeficiency, current use of immunosuppressive drugs, or long-term use of steroids; in such cases, the outpatient clinic of the department treating the primary disease should be visited.