Plugging a tooth generally refers to filling treatment. It is normal to have toothache after plugging. It is necessary to determine whether it is sensitive pain, dull pain, occlusal pain or spontaneous pain according to the nature of the pain, and choose the appropriate treatment according to the nature of the pain. 1. Sensitive pain: If you are very sensitive to hot and cold after plugging, it is usually due to the deeper position of caries, even close to the pulp, so there is pressure on the pulp cavity after filling, and the tooth will have a feeling of stress pain. You can brush your teeth with warm water, use anti-allergic toothpaste, try not to stimulate it, and the sensitive pain of hot and cold will be slowly recovered; if the pain is more serious, you can carry out the treatment of killing the nerve. 2. Dull pain: usually caused by improper filling process, the filling material has overhang, constantly stimulate the gums, need to go to the hospital in time to re-fill. 3. Occlusal pain: usually caused by the blocked tooth is too high, biting the high point, you need to go to the stomatology department in time for occlusal adjustment, which can effectively improve the occlusal pain. 4. Spontaneous pain: If spontaneous pain occurs after blocking the tooth, it is necessary to carry out the re-treatment of the tooth, or nerve treatment such as nerve removal to alleviate; if there is spontaneous pain, night pain, throbbing pain is very intense, usually to the extent of pulpitis, you need to consult a doctor in time, and actively carry out root canal treatment. After plugging the toothache, if the pain slowly improves, it is a normal reaction after the operation, you can observe for about two weeks, pay attention to avoid spicy and stimulating food; if the pain is very severe, or continues to aggravate, you need to consult a doctor in time, and if necessary, carry out the removal of the nerve or re-do the root canal treatment.