When children have oral ulcers, their oral intake of vegetables should primarily consist of green vegetables, while maintaining a balanced and reasonable diet that includes a variety of fruits and sources of protein such as fish, shrimp, and meat. For treating pediatric oral ulcers, topical medications can be applied, or oral ulcer patches can be used to promote healing at the ulcer site. Additionally, during the illness, it is crucial to drink plenty of water, rinse the mouth frequently, and remain hydrated to facilitate the healing of oral ulcers. During the illness, it is advisable to avoid consuming foods that might irritate the ulcers and cause pain, such as persimmons or granulated sugar, to prevent discomfort in children.