A very hard packet on the gums may be caused by alveolar bone hyperplasia, expanding tumors in the jawbone, fibrous gingival tumors, and so on. 1. Alveolar bone hyperplasia: Individual teeth can lead to excessive local chewing force due to early contact and lateral chewing. Alveolar bone hyperplasia occurs in order to better adapt to the excessive chewing force, thus encircling the neck of the tooth, resulting in a hard mass. 2. Expansion of local tumor in the jawbone: If there is malignant tumor in the jawbone, it can invade into the gums as the tumor grows. The texture of malignant tumor is hard, therefore, hard lumps may appear in the gum area. 3. Fibrous gingival tumor: due to the long-term chronic mechanical stimulation of the gums and the periodontal membrane and gingival connective tissue hyperplasia. Its main component is fibrous tissue, hard texture. It is recommended to go to the hospital in time, after a clear diagnosis under the guidance of the doctor’s treatment.