Oral diseases include endodontic-related diseases, periodontal tissue-related diseases, oral mucosa-related diseases, oral and maxillofacial surgery-related diseases, and manifestations of systemic diseases in the oral cavity. 1. Dental pulp-related diseases: such as the most common dental caries, pulpitis, apical periodontitis, etc., all belong to the dental tissues of the relevant diseases, the need for fillings or root canal treatment. 2. Periodontal tissue-related diseases: such as gingivitis, periodontitis, etc., requiring scaling or periodontal sequence treatment. 3. Diseases related to the oral mucosa: such as oral ulcers, lingual inflammation, lichen planus, leukoplakia, etc. Some of the above diseases are also divided into many types, with different treatment methods. 4. Diseases related to oral and maxillofacial surgery: such as maxillary and mandibular fractures, maxillofacial tumors, salivary gland diseases, etc. Most of them require surgical treatment. 5. Systemic diseases in the oral cavity: such as AIDS, leukemia, etc. These diseases are often combined with systemic symptoms and require treatment of systemic diseases. Stomatology is a discipline, which contains many specialties, generally speaking, below the arch of the eyebrow, above the neck, in addition to the eyes and nose area, the remaining belongs to the stomatological diseases, it is recommended that the patient if there is any discomfort, consult a doctor in a timely manner, and do not be negligent, so as not to delay the condition.