Hard like bone above the gums may be caused by alveolar bone growth, periodontitis, periodontal abscess and other factors. 1. Alveolar bone hyperplasia: hard like bone on top of the gums may be caused by alveolar bone hyperplasia, due to eating too hard food or frequent inflammation of the teeth, resulting in localized bone hyperplasia, outwardly supportive of the gums, the performance of the gums appeared to be hard phenomenon. 2. Periodontitis: the gums above the hard like bone may be caused by periodontitis, periodontitis is a soft tissue disease around the teeth, due to inflammation caused by bacterial invasion of the tissues around the teeth, mainly manifested as a hard packet on the gums, the patient will bleed when brushing teeth. 3. Periodontal abscess: hard like bone above the gums may be caused by periodontal abscess, due to local periodontal tissue infection and inflammation caused by periodontal pus overflow, there will be a hard bag above the gums, accompanied by fever, redness and swelling of the symptoms. Patients appear gums hard like bone, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease, and then follow the doctor’s instructions for treatment.