Teeth grinding in young children may be caused by uncoordinated bite, mental factors, disease factors and other reasons. 1. Uncoordinated dental occlusion: such as misalignment of teeth, teeth too long or missing, etc., can lead to uncoordinated occlusion, upper and lower teeth can not be a good match, the child in order to make as many teeth as possible contact with each other, which leads to teeth grinding. 2. Mental factors: such as excessive tension, fatigue, stress, etc., can cause cortical excitation, resulting in masticatory muscle contraction and lead to teeth grinding. 3. Disease factors: such as periodontal disease (periodontitis, etc.), intestinal parasitic infections, gastrointestinal disorders, vitamin D deficiency rickets, etc., may lead to teeth grinding. There are many other causes of teeth grinding in young children, which should be emphasized, and timely consultation should be made to identify the cause of the disease and follow the medical advice for further treatment or therapy.