In the dental clinic many patients because of teeth grinding syndrome, night grinding is the central nervous system cerebral cortex jaw running area of part of the brain cells are not normal excitation, resulting in trigeminal nerve dysfunction, trigeminal nerve innervates the masticatory muscles to generate strong persistent non-functional contraction, so that teeth rattling chewing movement. Generally categorized into 3 types: people between the ages of 6 and 13 years old are in the period of tooth replacement, in order to adapt to the upper and lower teeth grinding will have the phenomenon of teeth grinding. However, after the tooth replacement period of adolescents and adults who often have the phenomenon of teeth grinding is a pathological state. Types ①Teeth grinding type: often grinding teeth after falling asleep at night, which is often referred to as nocturnal teeth grinding, patients do teeth grinding or clenching action during sleep, due to the teeth grinding is often accompanied by “creaking” sound, usually also called “clenching teeth”. And because it occurs at night during sleep, also known as “night grinding”, the patient himself is not aware of, often told by others, because of the impact on others, especially spouses, and more attention. ② clenching type: often unconsciously clenching the teeth during the daytime when the attention is focused, but there is no upper and lower teeth grinding phenomenon. ③Mixed type: both night grinding and daytime teeth clenching phenomenon. Harm Medical experts pointed out that: due to the night grinding of teeth, resulting in strong knocking together, and no food to ease, resulting in excessive wear and tear of the surface of the teeth, so that the dentin under the protective substances exposed. In mild cases, the teeth are allergic to cold, hot, sour, sweet and other stimulating foods; in severe cases, it can lead to frequent bleeding, inflammation, loosening of the teeth or even loss of teeth. The most serious harm is the clenching of teeth at night and nocturnal teeth grinding. Nocturnal teeth grinding is mostly seen in children. Although nocturnal teeth grinding will not feel any pain for the time being, but in the long run, it can cause serious wear and tear of the dentition and neighboring surfaces of the teeth, as well as the complication of the above mentioned diseases, and persistent teeth grinding will lead to destruction of periodontal tissues, loosening or shifting of the teeth, recession of the gums, and loss of the alveolar bone. During the day we chew food also rubbing teeth, but very little damage to the teeth, this is because when chewing, the food between the upper and lower teeth is like a cushion, while there is sufficient saliva, so that the teeth slippery, so it is not easy to wear. In the meal looks like chewing for a long time, but most of the time is in the up and down movement, the real direct tooth contact has been studied only about 4 minutes. If you grind your teeth at night, the situation is very different, there is no food in the mouth, the secretion of the oral cavity is also reduced, the teeth do not get the necessary lubrication, and the formation of “dry grinding”, as if pushing the empty mill. The wear and tear of the teeth is very big, the consequences are also quite serious, at this time the worn teeth often have different procedures of acid or pain, sometimes also cause temporomandibular joint dysfunction, because of the destruction of the form and function of the dental system. It can in turn cause abnormal masticatory muscle function, such as masticatory muscle hyperfunction, spasm, fatigue, and pain. Muscle contraction imbalance, abnormal dentition position, change of intermaxillary vertical height, and dislocation of disc positional relationship also directly affect the normal morphology and function of the temporomandibular joints, manifesting symptoms such as pain at the mandibular joints, joint popping, and restriction of mouth opening. The pain is oppressive and dull, and is especially significant when waking up in the morning. People who grind their teeth at night can interfere with the sleep of others. In addition, chronic nighttime teeth grinding may lead to a series of complications. Such as: lead to chewing muscles do not get rest, resulting in chewing muscle fatigue and pain, pain in the cheeks; serious cases of headache, neck and back paroxysm, etc.; also lead to decreased sleep quality, memory loss, cause bad breath or bad taste, damage to the hearing and sense of taste, individual patients with heavy teeth grinding will lead to asymmetric face (usually manifested as a side of the face is large, a side of the face is small, resulting in psychological depression and pessimism, or even produce a light-hearted). This can lead to depression, depression and even despondency. Many severe patients are also accompanied by gastrointestinal disorders, constipation, decreased sleep quality, fatigue, lack of energy, lack of interest in things and other phenomena, especially because teeth grinding leads to sleep quality is affected, the daytime work and study are more prone to fatigue, so we must pay attention. Long-term teeth grinding will make extensive loss of dental tissues, tooth shape damage, sharp edges, often stabbing lips and cheeks, tongue soft tissue, face down 1/3 of the face becomes old, affecting the patient’s facial aesthetics and pronunciation. Dental bed often bleeding, inflammation, leading to loosening and loss of teeth teeth wear leads to allergies and pain in hot and cold acid pain cheeks and side ear area pain, damage to hearing head and neck muscle aches and stiffness, leading to recurrent headaches lead to bite through the cheeks, biting the bed of the teeth, biting cracked teeth, biting off the tongue affecting the development of young people’s physical localization and psychological health of the teeth biting the squeak affecting the loved ones to rest. In addition, if the child grinding teeth will also affect his growth and development, appear picky eaters, the formation of nutritional imbalance, short stature, thin, and the child’s teeth are developing during the teeth grinding will also destroy the beauty of the child’s teeth, so parents must pay special attention. Etiology (1) nervous tension, psychological anxiety, depression, anger and other psychological factors; (2) gastrointestinal diseases, endocrine disorders can also lead to this; (3) excessive fatigue, engaged in fine workers, such as athletes, watchmakers, etc.; (4) lack of micronutrients in the body susceptible to this disease. (5) long-term teeth grinding habitual teeth grinding syndrome; (6) work pressure, physical exertion, long-term irregular life leading to teeth grinding phenomenon! In addition to the above types of people, introverted, emotional, often mouth biting into the habit of people are also prone to teeth grinding disorder. Common causes in children 1, intestinal parasitic diseases, especially intestinal ascariasis, is quite common in children; 2, diseases of the gastrointestinal tract, oral diseases; 3, before going to bed to the children to eat indigestible food, so that after the baby goes to bed are likely to stimulate the corresponding parts of the brain, through the nerve caused by the chewing muscle continuous contraction; 4, neurological disorders, such as psychomotor epilepsy, hysteria, etc.; 5, the child’s daytime emotional Excitement, excessive fatigue or emotional tension and other mental factors. 6, lack of vitamins, suffering from vitamin D deficiency rickets children, due to disturbances in calcium and phosphorus metabolism in the body, which can cause bone decalcification, muscle pain and vegetative nerve disorders, often with excessive sweating, night terrors, irritability and nighttime teeth grinding. 7, teeth are not aligned, chewing muscles or chewing with one side of the teeth for a long time, as well as the teeth bite relationship is not good, temporomandibular joint dysfunction occurs, will also cause night grinding. Moreover, the teeth are not aligned children, his chewing muscle position is often not normal, night sleep, chewing muscles often unconscious contraction, causing teeth grinding. 8, in addition, the child 8 – 11 years old during the change of teeth, because of itchy gums, it is easy to produce a slight grinding phenomenon, this period of mild teeth grinding is a normal phenomenon, if the more serious need to be treated, after this stage, usually disappear on their own; 9, the child’s emotions and the impact of the rule of life, now the child is usually more intense learning, stress, while there are still a lot of children in the evening to see the thrilling fight TV These factors can cause teeth grinding. In addition, if because of something for a long time by the mother and father scolding, caused by repression, anxiety and anxiety, will also appear at night the phenomenon of grinding teeth; It can be seen, grinding teeth basically is caused by some kind of disease, some children due to grinding teeth for a long time, although by the appropriate treatment, but because of the cerebral cortex has been formed by the solid conditioned reflex, so the night of the teeth grinding action will not immediately disappear, it is easy to form a kind of habitual grinding of the teeth! Although the gastrointestinal disease has improved, but the gastrointestinal dysfunction still exists, so the teeth grinding action can’t be corrected in a short period of time, and must adhere to a longer period of time to improve the treatment. Teeth grinding on the baby’s 4 negative impact Baby occasionally occur once or twice at night teeth grinding, will not affect the health, mom do not have to worry too much. If the baby every day grinding teeth, to cause the attention of the mom, it is the baby’s negative impact is not small it. Early wear and tear of teeth Frequent teeth grinding will make the baby’s teeth premature wear and tear, exposing dentin, causing dentin allergy, encountering cold, hot, sour, sweet and other stimuli that occur strong pain. Affecting baby’s face When grinding teeth, facial muscles, especially chewing muscles, are constantly contracted, and over time, baby’s chewing muscle fibers will thicken and the face will become square, affecting baby’s face. Occurrence of temporomandibular joint disorder syndrome If the baby’s teeth are severely worn, the height of the teeth decreases, and the facial muscles are overworked, temporomandibular joint disorder syndrome occurs, in which soreness occurs in the baby’s jaw joints and localized muscles when talking, singing or eating, and even difficulty in opening the mouth. In the cerebral cortex to form a solid conditioned reflex Some babies because of grinding teeth for a long time, although after treatment, the cause of grinding teeth has been eliminated, but because the cerebral cortex has formed a solid conditioned reflex, so the night grinding action will not immediately disappear, the harm of grinding teeth will continue for a longer period of time.