Regular oral examinations are important for early detection of oral diseases as well as early treatment. We usually recommend patients to have a comprehensive oral examination every three or six months, including dental caries, periodontal conditions, as well as oral mucosa and glands, lymph nodes, etc. This is to maintain better oral health, as early oral diseases are not detectable. For example, the occurrence of dental caries (commonly known as “worm teeth”) is an intermittent process, there are no conscious symptoms in the early stage, until the development of a certain degree, will appear pain and be taken seriously. Similarly, periodontitis in the early stage is only bleeding gums and other minor symptoms, the patient will be ignored, such as loose teeth will go to the hospital, and then more have missed the best time to consult the doctor. Early examination of submandibular and cervical lymph nodes is also of great significance for early detection of oral and maxillofacial tumors. Some maxillofacial tumors will show lymph node metastasis in early stage, and if you find single, enlarged lymph nodes in submandibular or cervical area, especially those without obvious pressure, you have to pay attention to them, which may be the early manifestation of some tumors. In conclusion, early examination and early diagnosis will greatly reduce the difficulty and cost of treatment and greatly benefit the prognosis.