Endodontics mainly treats the following diseases: 1.Dental caries, various types of caries, including occlusal surface caries, adjacent surface caries, root surface caries, secondary caries, etc. are treated in endodontics. 2.Endodontic diseases, such as acute and chronic pulpitis, periapical periodontitis, can be treated by means of root canal treatment, and if inlay restoration is used after root canal treatment, endodontics can also complete it. 3.Dental hard tissue defects, such as trauma 4.Sensitivity and pain caused by hidden tooth fracture. 5.Sensitivity to cold, heat, acid and sweet caused by root exposure, some dentistry departments do not have special children’s dentistry, so children’s dental diseases can also be treated in the endodontics department, such as children’s caries, pulpitis of milk teeth, tooth surface coating, fluoride, sulcus sealant, etc. Fluoride, guttering, etc.