Tight teeth have been clenching is generally believed to be related to psychological factors or dental factors. 1. Psychological factors: when the brain is in a high degree of excitement and tension for a long time, it will act on the neuromuscular junction, so that the muscles around the mouth and jaw are also in a tense state, thus appearing the phenomenon of clenching teeth. Especially in modern times, people work and study under pressure, so they are often in a state of tension and anxiety, which leads to clenching of teeth. 2. Dental and jaw factors: such as long-term malformation of the jaw, missing teeth, missing teeth or too long, unilateral chewing, etc., can cause occlusal disorders, which can cause jaw joint disorders syndrome, in the muscle function is in the stage of disorders, the phenomenon of clenching can occur. There are many other possible reasons for tight teeth clenching, so you should consult your doctor in time to clarify the cause and treat it under the doctor’s guidance.