Teeth grinding, known in technical terms as teething disorder, is a common nighttime habit for many babies. About half of all young children grind their teeth occasionally, and this behavior usually occurs when babies get their incisors (two on top and two on bottom) around 10 months of age. Teeth grinding can continue until your baby is two or three years old and even beyond, with some children grinding their teeth all night long and others only intermittently. Nocturnal teeth grinding is very different from the friction of teeth chewing food during daytime meals. When chewing food, teeth are constantly lubricated by food, water and saliva during the friction process, mainly chewing food, while teeth wear less. Night grinding generally occurs after sleep due to the role of nerve reflexes, when there is no food in the mouth, the amount of saliva secretion is also very little, the teeth can not get lubrication, only up and down dry grinding each other, so that the teeth wear serious, affecting the health of teeth. The reason for baby teeth grinding? I. There are parasites in the intestinal tract, especially roundworms, which survive by absorbing nutrients from the human body. It is active in the human stomach, in addition to making people’s stomach pain, nausea, vomiting, serious people suffer from intestinal obstruction, sometimes also make people grind their teeth at night. Second, too tired or too excited during the day, especially children play too tired, after going to sleep, the cerebral cortex did not get a complete rest, part of the nerve is still in a state of excitement, will also go to sleep after grinding teeth. Third, stomach indigestion, stomach digestion for some reasons such as gastric disease, can not effectively digest food, so that after sleep grinding teeth. How can we prevent and control it? First, parents should pay attention to make the baby relaxed, especially in the 1-2 hours before bedtime, do not do some nervous and intense activities. Two, pay attention to adjust the diet, eat some easy to digest, nutritious food, do not eat too much dinner. 3. If intestinal parasites are found, they should be dewormed under the guidance of a doctor. If you have misaligned teeth or misaligned bite, correct them. V. If night grinding can not be corrected, you can go to the hospital dentistry department to make a “plastic dental pad” called teeth grinding orthodontic appliance. Wear it at night between the upper and lower teeth to prevent night grinding and protect the teeth.