The causes of teeth grinding include calcium deficiency, parasitic infection, etc., which need to be diagnosed and treated as soon as possible. 1. Calcium deficiency: Since the demand for calcium is relatively high during a child’s growth and development, insufficient intake of calcium or failure to take regular calcium supplements may lead to disorders of the child’s bones and nervous system, resulting in the symptom of thinness and grinding of teeth in sleep. 2. Parasite infection: due to the presence of parasitic infection in the child’s body, the toxins produced by the parasites lead to increased excitability of the nervous system during sleep at night, which induces the symptoms of teeth grinding. It is suggested that parents should strengthen the daily care of their children, regular diet, strengthen the child’s personal hygiene, regular supplementation of calcium and micronutrients, and find abnormalities in a timely manner to consult the doctor and give appropriate treatment to avoid delaying the condition.