The common causes of teeth grinding are: First, some teenagers or children have the habit of grinding their teeth at night, and their teeth will involuntarily touch each other and make a very harsh sound. Most of these teeth grinding refers to roundworms and pinworms; second point, autonomic disorders can also cause teeth grinding, mainly due to vitamin D1 deficiency, rickets children due to disorders of calcium and phosphorus metabolism in the body, causing bone decalcification, muscle pain and autonomic disorders, accompanied by excessive sweating, night terrors, irritability; third point, mental factors can also lead to teeth grinding, some people usually do not grind their teeth at night, but, but if in Just before going to bed to watch a horror movie or martial arts movie, because the nervous system is too excited, can also appear night grinding teeth; In addition, sometimes the brain is asleep too long, because the brain tissue carbon dioxide poisoning, oxygen supply is not enough, this stimulation can cause night grinding teeth; There are also neurotic lead to grinding teeth, this kind of grinding teeth occurs in the same principle as sleepwalking, is a waking disorder; There is too much dinner caused by grinding teeth, so Dinner should not be too full, after the meal should be appropriate activities.