Children who say their gums hurt after filling may be caused by dental caries, periodontitis, pulpitis, etc. They can be treated by general treatment, medication (sodium fluoride glycerin paste, metronidazole, procaine, etc.), surgery, etc., under the guidance of a doctor. 1. Dental caries: most of the disease is caused by the oral environment, dietary factors, self-factors, time factors, etc., which can lead to gum pain in children after filling, can be treated under the guidance of the doctor through the use of drugs, such as sodium fluoride glycerin paste, silver nitrate and silver nitrate, etc., but also through the isolation of the cotton rolls, rubber barriers to isolate the method of filling, filling and other surgical methods. 2. Periodontitis: children said after filling the gum pain may be caused by periodontitis, patients need to adhere to the correct way of brushing, remove food residues after meals, maintain oral hygiene, but also through the medication, commonly used drugs such as metronidazole, amoxicillin, erythromycin, etc., but also through the surgical treatment, such as scaling, scraping, periodontal flap surgery, soft tissue grafting, triggering tissue regeneration surgery, etc.. 3. Pulpitis: the disease is mainly affected by bacterial infection, chemical factors, physical factors, immune response and other factors, can lead to children fillings said gum pain, to avoid too hard, too cold, pay attention to oral hygiene, rinse your mouth after eating, can also be treated by drugs, ornidazole, tinidazole, procaine, etc., but also through surgical procedures, such as open pulp drainage, capping, root canal therapy, tooth extraction, and so on. It is recommended that patients go to the hospital in a timely manner, under the diagnosis of the doctor, according to the patient’s specific condition, to take targeted treatment, life to enhance physical fitness, maintain oral hygiene, the use of drugs need to comply with medical advice.