Teeth rubbing is generally referred to as teeth grinding. Teeth grinding in children’s sleep may be caused by mental factors, as well as other factors such as uncoordinated teeth bites, ascariasis, and heredity. 1. Mental factors: If children often feel anxious or nervous, or are too tense or excited before going to bed at night, it may lead to contraction of the chewing muscles, resulting in teeth grinding. 2. Disharmony of teeth: If children have missing teeth, or chewing with one side of the teeth for a long time, it may lead to disharmony of bite, which may easily induce the symptoms of teeth grinding. 3. Ascariasis: Ascariasis is caused by the ingestion of roundworm eggs, if children have ascariasis, not only will they have the symptoms of grinding teeth in bed, but also night terrors, convulsions, nausea, vomiting, abdominal pain, diarrhea, loss of appetite, intermittent pain around the umbilicus and other symptoms. 4. Other: children grinding teeth may also be genetic, taking psychotropic drugs, gastrointestinal disorders, periodontitis and other causes. It is recommended that children sleep with teeth grinding, parents need to take their children to the doctor in a timely manner, the doctor will choose the appropriate measures for the patient’s condition treatment.