The hidden pain of lower incisors, which is often referred to as the hidden pain of lower central incisors, is recommended to go to the professional stomatology department to be examined by the physician, and dental examination, if necessary, dental film can be taken to further clarify the diagnosis. In general, the most common occult pain is due to some occult caries, such as the caries on the adjacent surface of lower incisors, which is not easy to see with the naked eye and may cause occult pain. The hidden pain of the lower incisors may be caused by the hidden crack of the tooth, that is, an invisible gap in the tooth, which leads to the entry of bacteria and the hidden pain. Finally, there are some periodontal problems, some combined periodontal and pulpal lesions may occur in the lower incisors, causing the lower incisor pain. All of these may cause hidden pain in the lower incisors, so it is necessary to go to a professional dental institution for differential diagnosis of the disease.