Swelling of the face after the tooth split in half after restoration may be caused by inflammation and root canal sealant stimulation of the root tip. 1. Inflammation: the excess bonding agent in the interspace of the tooth is not completely removed after the tooth is split in half, which destroys the self-cleaning effect of the tooth, and the gums are squeezed to produce inflammation. There may be symptoms of facial swelling and pain. 2. Root canal sealant stimulates the root tip: If the tooth splits and exposes the nerve, root canal treatment is needed. In the process of root canal treatment, the instrument damages the root tip, the drug penetrates into the root tip or the filling material stimulates the root tip, and the pain and swelling of the face may occur after the restoration. After the tooth is split in half and the face is swollen after restoration, it is recommended to go to the regular hospital stomatology department to do further examination, take a dental radiographs, clarify the cause of the disease, and then actively anti-inflammatory treatment and restoration under the guidance of the doctor.