Children sleep grinding teeth and swallowing saliva may be due to unstable bite, parasitic infection and calcium deficiency. 1. unstable bite: small children’s teeth joint stability structure has not been fully established, in a state of unstable bite, and facial muscle development is not perfect, so there will be children sleep grinding teeth, swallowing phenomenon. 2. Parasite infection: If the child is infected by parasites in the intestinal tract, to sleep at night, parasite activity is relatively frequent, which will lead to reflexive spasm of the biting muscle, spasm of the biting muscle contraction, not only will cause the child to grind his teeth, but also stimulate the salivary glands to secrete saliva, the child will be swallowing saliva. 3. Calcium deficiency: children with calcium deficiency, calcium and phosphorus metabolism disorders in the body, which can lead to autonomic nervous system dysfunction, dental decalcification and other abnormalities, which leads to children’s nighttime sleep grinding teeth, swallowing saliva. If the child sleep grinding teeth and swallowing saliva, parents should pay attention, take the child to the hospital in time to find out the cause of the disease, by professional doctors to implement individualized treatment.