The pain between two teeth is caused by the following two reasons: First, caries, if there is caries in the middle of two teeth or single tooth has caries, the phenomenon of food embedment will appear in the middle of two teeth, which will lead to gum swelling and pain, and then you will feel the pain between teeth. The treatment method is usually to fill the cavity, or to fill the cavity after the endodontic treatment, after filling the cavity, the shape of the tooth and the adjacent relationship will be restored, and no pain will occur. Second, if the periodontal condition is not good, it may also appear the phenomenon of tooth pain. Because of poor periodontal conditions, gum recession can also produce food embedment in the horizontal or vertical direction, and this food embedment can also lead to pain between the two teeth. This is when we need periodontal treatment, which usually includes scaling, subgingival scaling and root planing. After the treatment, we can use mouthwash to quickly relieve the swollen and painful gums, and the gap pain will be improved.