There are more reasons why children grind their teeth at night, and there are usually several aspects that can be considered: 1. Problems with the nose. Whether there is nasal congestion, runny nose, sneezing, whether it is necessary to consider the backflow of nasal secretions into the mouth, and children will not take the initiative to clean the foreign body in the mouth at night, which will induce the baby to appear the symptoms of grinding teeth. 2, whether the baby has dental caries. When there is tooth decay, the teeth and gums around the uncomfortable, also will appear the performance of grinding teeth. 3, how the digestive function. Whether too much food before going to bed, or into more liquid food, so that the child in the process of sleep, appear for the gastroesophageal reflux, when the mouth reflux foreign body will also induce grinding teeth. 4, when the baby daytime activities, the spirit is too nervous or too excited, night sleep will not be very solid, will also appear grinding teeth symptoms. Therefore, when the baby has teeth grinding, you also need to closely observe whether there are other accompanying symptoms, to combine with the accompanying symptoms, a comprehensive analysis of what the possible causes are, and then deal with the corresponding.