Educate your child about oral hygiene, cultivate good hygiene habits of brushing teeth in the morning and evening and rinsing after meals, and eat less snacks and sweets in general, and the swollen and painful gums will be relieved accordingly. If the swollen and painful gums still recur with the above adjustments, you need to visit the hospital promptly for a systematic examination to see if the swollen and painful gums are caused by systemic diseases.”