After children fall asleep at night, the lower jaw is still in motion and the upper and lower jaw teeth rub against each other, producing an ear-piercing sound, which is often referred to as nocturnal teeth grinding, which is mostly seen in children aged 4 to 6. Common causes and treatment: 1, intestinal parasitic disease, especially intestinal roundworm disease, extremely common in children, check the stool routine, if diagnosed, you need to use intestinal worms to deal with; 2, gastrointestinal tract diseases and oral diseases, food reflux easily lead to grinding teeth at night, give the child to eat probiotics, regulate the gastrointestinal tract, with oral anti-inflammatory spray treatment of oral inflammation; 3, neurological Diseases such as psychomotor epilepsy, hysteria and so on, this need to give the child to do a 24-hour dynamic EEG clear diagnosis; 4, vitamin D deficiency, resulting in the child’s body calcium and phosphorus metabolism disorders, will cause calcium deficiency, muscle pain and plant nervous disorders, common in sweating, irritability and night grinding teeth, timely supplementation can be. 5, in addition to children 8 to 11 years old, during the replacement of teeth because of itchy gums, it is easy to produce a slight grinding phenomenon, this period of mild teeth grinding is a normal phenomenon, if more serious, need to be treated, after this period of time can be relieved naturally, only to clarify the causes of children grinding teeth, symptomatic treatment, to alleviate the situation of children grinding teeth.