What is difficulty opening the mouth? The normal degree of mouth opening is about the width of the index finger, middle finger and ring finger when they are brought together. There are many clinical diseases that can cause mouth opening restriction, generally speaking, if the patient can only open the mouth to accommodate two fingers, it is called mild mouth opening restriction; if the mouth opening degree can only accommodate one finger, it is called moderate mouth opening restriction; if the mouth can not even accommodate a finger after opening, it is called dental closure. What can be done to prevent mouth opening difficulties? Difficulty in opening the mouth is a clinical manifestation of temporomandibular joint disorder, also called temporomandibular joint syndrome, which is one of the common diseases of the oral and maxillofacial region. Among TMJ disorders, this disease is the most common. It occurs in young adults, with the highest prevalence in the 20s and 30s. Temporomandibular joint dysfunction syndrome self-treatment precautions: 1, eliminate all unfavorable mental psychological factors, such as improving the symptoms of neurasthenia, this disease has a good prognosis, to enhance confidence, and appropriate sedative and sleeping drugs. 2, avoid opening too much to cause joint sprain, such as yawning. Laughing. After stimulated by cold, prevent sudden chewing movement to avoid muscle spasm. Injury of joint ligaments. Correct bad chewing habits, such as unilateral chewing and clenching teeth at night. Temporomandibular joint dysfunction syndrome life precautions: 1. In principle, diet should not be restricted, but avoid chewing cold and hard food. 2. Eliminate the mental tension and maintain an optimistic, relaxed and open-minded mental state. Pay attention to the combination of work and rest, and actively participate in cultural and sports activities. 3, do not develop the habit of clenching teeth when working under tension. 4. Do not open your mouth wide, and pay attention to protecting the jaw joint when yawning. 5.Pay attention to the cold and warmth of the face in winter. 6.When extracting obstructed teeth, pay attention to protect the jaw joint; when other intraoral treatment, pay attention to prevent the patient from opening the mouth widely for a long time.