We all know that tooth decay is caused by the love of sweets and the lack of attention to oral hygiene, resulting in the growth of bacteria in large quantities. Generally, there is no uncomfortable symptom in the early stage of tooth decay in the mouth, but if it is not treated in time, it will lead to the aggravation of the damage of tooth decay, and the bacteria will enter the pulp cavity and destroy the nerve of the tooth to induce pulpitis, especially in the night when it is too painful to sleep. In the early stage of pulpitis, the pain can be relieved by medicine, but in the later stage, it is impossible to relieve the pain effectively. When treating pulpitis, our dentists usually choose the treatment according to the extent of the damage to the patient’s teeth, usually in the form of pain relief and tooth treatment in the form of opening and decompression, and for severe bad teeth can only be extracted. Therefore, when we know that pulpitis can bring us a lot of pain, we should pay attention to oral hygiene health care work in general, and eat less food that can stimulate and damage teeth. Regular oral examination and timely treatment of tooth decay should be carried out to prevent the occurrence of pulpitis.