To determine whether a child’s teeth grinding is due to food retention or parasitic infection, you need to observe the child’s stool, and you need to go to the pediatric department of a regular hospital to have a stool test to determine whether there is a parasitic infection. In daily life, you can observe your child’s stool, if your child’s digestion is not good, constipation or fire, it is possible that the grinding of teeth is caused by accumulation of food. It is recommended to check whether the child has parasitic infection through stool testing. If parasites or eggs can be detected in the stool, it means that the teeth grinding is caused by parasitic infection. According to clinical research, teeth grinding is related to mental state. If the stress in life and study is too high, or if there are some adverse events leading to high mental tension, the cerebral cortex is still not in a relaxed state during sleep, so that the muscles around the mouth heat are still tense, and then teeth grinding will occur. When the child appears to grind teeth, it is recommended to go to the regular hospital in time for examination, as soon as possible to clarify the cause of the active treatment, to avoid misunderstanding the condition caused by the adverse effects.