The time it takes for pulpitis to develop until pulpal necrosis cannot be determined. In some patients with chronic pulpitis, the length of pulpal necrosis may take six months or longer. Pulpitis is a type of inflammation of the dental pulp tissue. The common symptom is increased sensitivity to cold, heat and other irritants, and some patients may experience constant severe pain, fever and other symptoms. Pulpitis can be classified as acute pulpitis or chronic pulpitis according to the disease. Acute pulpitis can be treated by preserving the living pulp. The first treatment is by anti-inflammatory and analgesic types of drugs, such as metronidazole and ibuprofen. The pain can be significantly relieved after 2-3 days. If necessary, follow-up treatment can be performed with direct pulp capping or pulpotomy. For chronic pulpitis and recurrent patients, pulpotomy can also be considered to better achieve the desired treatment effect. In the course of daily life, good habits such as brushing the teeth in the morning and evening or rinsing the mouth after meals should be adhered to, so that the residues and bacteria left in the oral cavity can be removed in a timely manner to prevent the occurrence of periodontal diseases.