There are several reasons for the pain at the gap between teeth: Firstly, there is a local food embedment, once the food embedment occurs, the gum tissue will be swollen and painful, and it is necessary to floss the teeth in time. Secondly, it is possible that the tooth in the gap is decayed, and the decayed part may be caused by the frequent occurrence of food embedding. Once the decay occurs, it is more likely to occur food embedding, and with the deepening of the decay, the pain is more and more obvious, so it is necessary to carry out repair treatment. Thirdly, if there is inflammation in the gum tissue at the tooth gap, such as periodontitis, it will also cause pain in the gum tissue when it is serious, and it needs to be treated systematically for periodontitis.