Children sleep grinding teeth for the following reasons: First, there are parasites in the intestine, the intestinal parasites will stimulate the nerves at night, and the parasites will secrete a lot of toxins, the body will be absorbed to stimulate the child’s brain, resulting in chewing muscle spasm or contraction caused by sleep grinding teeth. Second, the poor development of teeth, such as uneven teeth, often chew food with one side of the teeth, teeth bite is not good, these will lead to jaw joint function problems, resulting in sleep grinding teeth. Third, low blood calcium, low blood calcium will lead to instability in the function of the cerebral cortex, will be stimulated to disorder, will lead to chewing muscle group contraction for a long time caused by grinding teeth. Fourth, too much dinner will increase the burden on the stomach and intestines, at bedtime, a lot of food accumulates in the stomach and intestines, the digestive system still needs to continue to work, and even the chewing muscles are mobilized to cause teeth grinding.