Baby grinding teeth, especially at night, the possible causes are digestive tract dysfunction, nerve overexcitation, oral diseases, etc., as follows: 1, digestive tract dysfunction: indigestion or dinner eaten too much, can cause grinding symptoms, intestinal parasitic disease, especially roundworm infection, can also lead to baby grinding teeth. 2, nerve overexcitation: children play too tired during the day, or too excited before bedtime, as well as watching a stressful film or television, etc., may also make children’s brain cortex is still in an excited state after sleep, leading to grinding teeth. 3, oral diseases: such as caries, periodontitis, dental bite is not coordinated. 3, oral diseases: such as dental caries, periodontitis, teeth bite incongruity, etc., can also cause the symptoms of grinding teeth. In addition, some of the children’s teeth grinding may also be related to the lack of vitamin D, genetics, neurological diseases and other factors, if the baby often grind teeth, it is recommended to actively seek medical examination.