(Disclaimer: This article is only for scientific use, in order to protect the privacy of patients, the relevant information in the following content has been processed) Abstract: A baby mother with a 2-year-old child to the examination, because of tooth discoloration, feel that children eat without front teeth, do not understand the reason to seek the help of doctors, after examination and careful questioning of medical history, the diagnosis of pulp necrosis and chronic periapical inflammation, and the parents of the child to communicate with the condition, after the parents We performed root canal treatment on the baby tooth with the consent of the parents, and the treatment result was good and the parents were satisfied. The patient’s parents were satisfied with the treatment result. [Basic information] Female, 2 years old [Disease type] Pulp necrosis and chronic periapical inflammation [Hospital] Inner Mongolia Autonomous Region Women’s and Children’s Hospital [Consultation date] January 2020 [Treatment plan] Root canal treatment for milk teeth (pulp extraction, root canal irrigation, open drainage) [Treatment period] Outpatient treatment 3 times, once a week, 3-month outpatient follow-up [Treatment effect] Normal diet, good treatment effect I. When the first interview was almost finished, a mother ran into the office with her 2-year-old child in a hurry, “Doctor, my child’s teeth are discolored, I feel that my child does not use his front teeth to eat, and he does not eat well. The parents came back and found that the color of the teeth had changed and the child was not eating with his front teeth. I also asked about the child’s usual tooth brushing and nighttime feeding. The baby’s mother said that she usually brushes her teeth very scribbly and the cooperation is not very good. Night feeds were frequent until one and a half years old, and the child was also usually a milk sleeper. Oral examination of the child revealed that the milk teeth were in the row, with general oral hygiene and normal occlusal relationship; 51 and 61 had grayish and lustrous crowns with circumferential defects; 51 had percussion pain (-), probing (-), looseness (-), no obvious abnormalities in the gums, and no response to hot or cold stimulation; 61 had percussion pain (+), probing (-), looseness (-), no obvious abnormalities in the gums, and no response to hot or cold stimulation. On auxiliary examination, dental films showed that 51 and 61 had defective crowns, 51 root apices did not show significant hypodense images, 61 root apices were visible with significant hypodense images, and 11 and 21 permanent tooth germ were visible. The preliminary diagnosis of pulpal necrosis and chronic periapical inflammation was made through the examination combined with the medical history. The general treatment plan for this case was 51 and 61 root canal treatment, oral hygiene education, and follow-up every 3 months. Before treatment, I communicated in detail with the parents of the child. Considering the child’s nervousness, I reassured the child and relaxed him, and the child was willing to cooperate with me and did not move significantly. I carefully removed the crown and opened the pulp to expose the pulp cavity, and the child cooperated very well. After simple treatment, pulp removal, root canal irrigation, and open drainage, the child’s first dental visit was successfully completed, and the parents were informed to have a follow-up visit every other day to change the medication. 1 week later at the follow-up visit, the second root canal treatment of the baby tooth was completed. The child and the parents cooperated well throughout the treatment, which made the treatment go smoothly and the treatment result was satisfactory. Before treatment, the child did not use the front teeth to gnaw food, and occasionally cried when touching the front teeth during meals. Before treatment, the parents were not serious about brushing the child’s teeth and were not quite able to master the brushing skills. After treatment, after careful guidance from the doctor, the parents’ awareness of oral care improved and they made great progress in brushing the child’s teeth. After 3 months of treatment, no significant abnormalities were found in the affected teeth. IV. Precautions After the systematic and effective root canal treatment, we are glad that the child’s dental problems gradually disappeared, but there is a long way to go for dental health. After this treatment, parents should take good care of the child and try to avoid any further trauma to the tooth, and in case of dental trauma, you should consult the dentist for detailed examination. In terms of diet, semi-liquid food should be the main food, avoiding the intake of stimulating food, such as too cold and too hot food, and parents of children with the disease should control the frequency and quantity of sweets their children eat. Strengthen the child’s oral care work, must brush teeth every day before going to bed, and no food should be eaten after brushing teeth. Develop good habits and benefit for life. We also need to follow up on time, usually in 3, 6 and 12 months, and if we find any uncomfortable symptoms, we will follow up at any time. One of the main causes of pulpal necrosis is trauma, which is often ignored by parents because there is no obvious bleeding and pain. The most common treatment method is root canal treatment, the main principle of which is to reduce the impact on permanent teeth. The main principle is to reduce the impact on permanent teeth, and follow-up visits for five consecutive years after trauma require adequate parental attention and good compliance. Parents and children also need to raise awareness of oral care and proper brushing methods.