Baby sleep teeth grinding can be caused by a variety of reasons, more common, for example, when the baby has a cold, nasal congestion, runny nose, sneezing, etc., the relative increase in nasal secretions, which can flow backwards along the postnasal cavity to the baby’s mouth. Smaller babies are unable to clean the foreign body in the mouth in time, when the situation of teeth grinding will occur. In addition, the baby eating, eating milk, etc. too full, too much, in bed lying position is prone to gastroesophageal reflux, so that too much food from the digestive tract reflux to the mouth, the situation of grinding teeth. Some babies are in the process of teething, the gums will be congested with uncomfortable and swollen feelings, there will also be instinctive grinding of teeth to try to solve the uncomfortable feeling. There are also some babies who are too excited or too nervous or frightened during daytime activities, and are in a state of relative brain excitement during sleep, and will also show teeth grinding performance.