A small cusp on the gums may be a remnant of the dental plate epithelium left over from the tooth development process, or it may be a sign that permanent teeth are about to erupt during the replacement period. 1. Plate epithelium remaining. In the process of tooth development, the epithelial cell mass of the dental plate will generally degenerate, if it fails to degenerate normally, it will exist in the jawbone and gums, generally shortly after the birth of infants, the epithelial remnants of the gingiva can be observed as a white bump of the size of a needle tip, which can be detached on its own. 2. Permanent teeth are about to erupt. If in the children’s teething period, the gingiva appeared on the tip of a small tooth, the original milk teeth have been extracted, may be under the milk teeth of the permanent teeth will soon break the gums and out. x-ray examination can be seen in the permanent tooth embryo. The presence of a cusp on the gums needs to be confirmed by an oral and x-ray examination at the hospital.