There are many causes of drooling in children’s sleep, the most common being incomplete oral development, poor hygiene, improper sleeping posture, malformed teeth, and indigestion due to weakness of the spleen and stomach. Newborns salivary gland development is incomplete, rarely occur drooling phenomenon, but after 6 months due to changes in the structure of the diet, stimulate the brain nerve to promote the secretion of salivary glands, and children’s shallow mouth, can not accommodate too much saliva, will occur sleep drooling phenomenon; a large number of food residues piled up on the surface of the teeth, if not cleaned in time, easy to cause bacteria in the mouth, stimulating the production of saliva resulting in drooling Parents can help children adjust their sleeping posture to relieve drooling; improper chewing during dental development can cause teeth to close improperly, making it difficult for the lips to wrap around the teeth during sleep, which can be improved through orthodontics; orthodontics can help children with a weak spleen and stomach to take Chinese medicine or food that can strengthen the spleen, such as congee with cinnamon and lotus seeds and red dates and millet congee. The specific measures are recommended to consult a doctor. There are many reasons for drooling, and the above analysis is only for common cases, so we cannot list them all.