The possible reasons for 14-year-old boys grinding their teeth at night in their sleep include calcium deficiency, intestinal parasites, and mental factors, which should be actively treated. 1. Calcium deficiency: If the calcium and phosphorus metabolism in the body is disturbed and lack of vitamin D, the phenomenon of grinding teeth at night will often occur. You can take calcium supplements under the guidance of your doctor, and the phenomenon of teeth grinding at night will improve. 2. Intestinal parasites: Intestinal parasites in the human intestines, not only plunder nutrients, but also stimulate the intestinal wall, secretion of toxins, causing indigestion, vague pain in the stomach, which will cause insomnia, irritability and grinding teeth at night. It is necessary to consult a doctor in time and carry out deworming treatment under the doctor’s guidance. 3. Mental factors: If the child’s mental state during the day is over-excited or tense, teeth grinding at night will occur due to over-excitement of the nervous system. It is recommended to do more exercise, timely detoxification of emotions, and maintain a good mental state. In serious cases, it is recommended to actively seek medical attention to clarify the cause of the disease and carry out targeted treatment.