Intermittent toothache is usually a possible symptom of chronic pulpitis. And this chronic pulpitis usually has hot and cold irritating pain, a burst of pain will also occur occasionally pain, occasionally good phenomenon, this situation can generally choose to do dental nerve killing treatment, after taking out the nerve, the tooth will be able to quickly relieve the pain. Generally, after taking out the nerve, it is necessary to do the filling of the root canal of the tooth, the conventional use is hot glue filling, and it is recommended to close the crown tightly, so that it is conducive to the formation of a closed environment inside the tooth to avoid recurrence, and also to avoid secondary decay or re-infection. It is also recommended to have a porcelain crown to avoid fracture of the tooth. After the nerve is removed from the tooth, it is easy to produce the phenomenon of no nutrition supply, and the tooth is fragile and easy to fall down piece by piece. Therefore, braces should be made so that it can have resistance.