Neighborhood caries is a very common clinical caries site, refers to the caries that occurs between two teeth, caries is more insidious when new, not easy to be detected by the patient. The most common cause of neighboring caries is food impaction, in which food debris and bacteria are often embedded in the gap between the teeth, and caries will be formed on both sides of the area over time. Once the caries is detected, it is recommended to go to a professional dentist as soon as possible for treatment, take dental radiographs to determine the neighboring caries, check the scope and depth, apply the dental power system, open the neighboring surface from the jaw to remove the decayed part, and then apply the shaping system to repair the tooth, and then the treatment of neighboring caries will be completed.