One-year-old baby grinding teeth during the day, if the baby is in the awake state, it may be because the baby is teething causing gum itching resulting in the baby grinding teeth on its own to relieve. If the baby is asleep, it may be related to the baby’s gastrointestinal function, such as feeding too much, indigestion, intestinal parasitic disease, etc. will cause the baby to grind teeth, and at the same time need to consider whether there is a dental bite relationship incongruity factors, when there is grinding teeth should visit the hospital to identify the cause. First, the digestive system factors: 1, indigestion: if the baby eats too much will lead to excess food in the gut, the digestive system will continue to work when sleeping, resulting in the baby grinding teeth; 2, malnutrition: unbalanced nutrition of the baby will also cause the grinding of teeth, especially when the lack of calcium, phosphorus and various vitamins, this disease is more obvious. Pay attention to help the baby to do a good job of dietary adjustment, to develop good eating habits, to avoid nutritional imbalance; 3, intestinal parasites: parasites in the small intestine to plunder various nutrients and secrete toxins, stimulating the intestinal tube to speed up peristalsis, causing indigestion, navel around the hidden pain, so that the baby in the sleep of neural excitability instability and cause teeth grinding. To relieve this disease, a good way is that you should promptly deworming, as long as the parasites disappear, the baby’s teeth grinding symptoms can be relieved. Second, mental factors: baby in no sense of security, recently frightened or excessive nervous tension, will also appear to grind teeth during the day. If the baby is too excited before bedtime, it will also lead to grinding teeth in bed. To relieve this disease, do not overly tease the baby before bedtime, so that they are in a quiet state, can improve the quality of sleep and reduce the disease of teeth grinding. Third, oral factors: the bite is not coordinated is considered the main factor of teeth grinding disorder, including the wrong jaw, missing teeth, missing or overgrown teeth, unilateral chewing, etc.. Some of the one-year-old babies have misshapen jaws such as antimandibular and deep overlapping jaws, resulting in the upper and lower teeth not being able to bite well together, leading to spasm and contraction of the chewing muscles, and triggering teeth grinding. It is necessary to avoid laying down to eat milk to aggravate the anti-jaw, find out the caries timely treatment, after 4 weeks of age can be orthodontic under the guidance of dentist to relieve the teeth grinding symptoms.