1, intestinal parasitic diseases, especially intestinal ascariasis, which is quite common in children; 2, diseases of the gastrointestinal tract, oral diseases; 3, give the child to eat indigestible food before going to bed, so that after the baby goes to bed are likely to stimulate the corresponding parts of the brain, through the nerves caused by the continuous contraction of the muscles of mastication; 4, neurological disorders, such as psychomotor epilepsy, hysteria, etc.; 5, the child during the day, emotional excitement, excessive fatigue or Emotional tension and other mental factors. It can be seen that teeth grinding is basically caused by some kind of disease, some children due to teeth grinding for a long time, although by the appropriate treatment, but because the cerebral cortex has formed a solid conditioned reflex, so the teeth grinding action at night will not immediately disappear, especially the gastrointestinal disease although there is an improvement in gastrointestinal dysfunction still exists, so the teeth grinding action can not be corrected in a short period of time, and must adhere to a longer period of time to improve the treatment. Therefore, teeth grinding can not be corrected in a short time and must be treated for a long time to get better. Teeth grinding treatment principle: ① remove the causative factors, especially psychological factors and local factors. ② Treatment of systemic diseases related to the onset of teeth grinding. ③ for recalcitrant cases should pay attention to the protection of periodontal tissues and muscles, can make a smooth and hard surface pads, covering the tooth surface and extend to the buccolingual side of the shape of the high point, can avoid the lateral bite medical education | net collection of interference force, need to be checked regularly. ④ Treatment of various complications caused by excessive wear.