After the appearance of apical periodontitis, root canal treatment or oral care can be carried out to avoid aggravation of symptoms. 1. Root canal treatment, after the emergence of apical periodontitis, the pulp is usually necrotic, at this time need to carry out root canal treatment in a timely manner. It is necessary to remove the inflammatory substances inside the root canal, remove the necrotic nerve, and at the same time, it is also necessary to carry out root canal filling repair, so as to effectively alleviate the symptoms of apical periodontitis. In addition, the brittleness of the tooth increases after root canal treatment, and it is recommended that crown repair be carried out in time to prevent splitting. 2. Oral care, treatment of apical periodontitis process usually need to pay attention to good oral care, maintain oral hygiene, diligent brushing and rinsing, but also need to eat less sugary foods, so as not to lead to dental caries, if caries best to see a doctor as soon as possible.