Patient: Hello doctor! My little daughter is three and a half years old and has always had good teeth. Recently, one of the incisors has turned gray in color and the child does not feel any discomfort. The doctor said it was pulpal necrosis caused by a previous fall, but since it was a baby tooth, he said it did not need treatment as long as there was no pain, and that it would recede when she changed her teeth at the age of six or seven. However, I saw another doctor who said that root canal treatment was needed. It is very contradictory. Everything is normal except for the obvious gray color of the teeth. Thank you! Yan Lijin: First of all, we need to determine whether the child’s tooth discoloration and pulp necrosis is caused by a fall or caries, etc. If possible, we can take an X-ray to observe whether the root tip of the baby tooth has an effect on the permanent tooth embryo. Generally speaking, if the traumatic pulp necrosis is not infected by bacteria, there is no damage to the permanent tooth embryo and the child is young, it can be observed and checked at the hospital once in 3 months; if there is infection and other problems, root canal treatment or even extraction of the baby tooth should be carried out in time according to the age and root condition. However, if the pulp necrosis is caused by bacteria and caries, root canal treatment should be performed to avoid the inflammation from affecting the permanent tooth germ.