Thrush is a disease caused by oral mucosal infection with Candida albicans, and typically, one should visit the pediatric department or the department of stomatology during normal working hours. During off-hours, such as noon, evening, weekends, and holidays, it is appropriate to see pediatric emergency or dental emergency services. For newborns with thrush, a visit to the neonatology department is recommended. Children with underlying immunodeficiency diseases or those taking immunosuppressive steroid medications should visit the department that treats their primary condition. (The use of medication should be under the guidance of a professional doctor.)