What should I do if a child has bad breath and mouth ulcers?

1. Dietary adjustment: Encourage children to consume more fresh fruits and vegetables rich in vitamin C, iron, and fiber, such as oranges and grapefruits, while reducing intake of spicy and irritating foods to promote healing of oral mucosa and improve the oral environment. 2. Oral hygiene: Encourage children to develop good oral hygiene habits, including regular tooth brushing and mouth rinsing, and avoid using hard-bristled toothbrushes that may excessively irritate affected areas. Maintaining oral cleanliness helps prevent secondary infections and accelerates ulcer healing. 3. Nutritional supplementation: Appropriately supplement B-complex vitamins and zinc, which can be achieved through oral vitamin B complex supplements or zinc-rich foods. These nutrients are essential for maintaining healthy oral mucosa. 4. Local treatment: When oral ulcer symptoms are severe, topical medications with anti-inflammatory and analgesic effects—such as compound benzocaine gel or triamcinolone acetonide oral ointment—may be applied to the ulcer surface according to product instructions to relieve pain and promote healing.