Hand, foot and mouth disease is a common disease in children under 5 years old. The disease causes many complicated and dangerous complications that can lead to death. The disease is characterized by blister-like skin lesions on the oral mucosa, palms, and soles. One of the common complications is widespread mouth ulcers, secondary infections causing pain and discomfort for children. Therefore, it is necessary to know how to care for and clean children's mouths.