What should I do about a child's bad breath and mouth ulcers?

1. Dietary Management: Encourage children to eat more fresh vegetables and fruits rich in vitamin C and vitamin B, such as carrots, spinach, watermelon, etc. Avoid overly sour, spicy, fried, or hard foods, which may aggravate ulcer pain or damage the oral mucosa. Maintain a balanced diet, avoid picky eating, drink adequate fluids, and keep the mouth moist. 2. Medication: For ulcers causing significant pain, topical medications such as oral ulcer powder, Bingbor Powder, or Kailoujian spray may be used under medical guidance to relieve pain and promote healing. If the ulcer is associated with viral or bacterial infection, antiviral or anti-inflammatory treatment should be administered according to medical advice. 3. Other Treatments: For recurrent oral ulcers, immunomodulatory agents such as corticosteroids may be considered, or physical therapies like laser irradiation may be used under medical supervision to promote ulcer healing.