When we have oral diseases, we know that we have to go to the stomatology department of the hospital, however, in some big hospitals and professional dental hospitals, the subspecialties are often more detailed, when we have toothache and other discomfort, and do not know which department to hang, in order to facilitate your smooth consultation can refer to the following rules. Endodontics: Mainly dental diseases, such as dental caries (commonly known as “tooth decay”), pulp disease, periapical disease, and discolored teeth or teeth with defects, etc.. The symptoms are mainly toothache, and the treatment means are mainly anti-inflammatory, pain relief and cavity repair, as well as cosmetic tooth bleaching, etc. Periodontal mucosal disease department: mainly looks at diseases of periodontal and mucosal tissues, such as gingivitis, periodontitis, oral mucosal disease, etc. The symptoms are mainly red and swollen gums, bleeding, loose teeth, ulcers, etc. The treatment means mainly include oral cleaning, various periodontal surgeries and medical treatment, which is usually called medication and injection. Oral and maxillofacial surgery: mainly looks at inflammation, trauma, deformity, tumor and other diseases of the maxillofacial area, and the treatment is mainly based on surgical procedures (including tooth extraction). Oral Prosthodontics: mainly looks at the restoration treatment of dental defects, tooth loss and missing teeth, that is, dental veneers, including fixed prosthesis and removable partial denture; and also the restoration treatment of maxillofacial defects, periodontal diseases and temporomandibular joint diseases. Orthodontics: The main focus is on patients with unevenly aligned teeth who require orthodontic treatment. Its characteristics are to meet the cosmetic requirements of patients to a large extent, in addition to restoring the function of occlusion. Oral preventive health care department: mainly carries out regular oral health examination and oral health education, takes various preventive measures (including application of various fluoride caries prevention methods, sulcus closure, preventive scaling, etc.) to prevent the occurrence of oral diseases, and sometimes does some simple treatment of common oral diseases for the convenience of patients by the way. Pediatric dentistry: The department specializing in the diagnosis and treatment of oral diseases for children and teenagers. Oral Implantology: After tooth loss, we can use pure titanium implants with excellent biocompatibility to restore single, multiple or full teeth in the alveolar bone. It is the best restoration method for missing teeth, and is therefore known as the “third set of human teeth”.