Common causes of hard white bumps on the gums that look like bone include alveolar bone hyperplasia, periapical inflammation, epithelial beads, and so on. 1. Alveolar bone hyperplasia: Inflammatory stimulation, localized chronic bone marrow inflammation, apical periodontitis, periodontitis, etc. can lead to alveolar bone hyperplasia, white bumps on the gums. 2. Periapical inflammation: chronic periapical inflammation may also appear in the gingival abscess, hardening and other manifestations, there may be spontaneous persistent dull pain, occlusal pain, and loosening sensation when touching. 3. Epithelial beads: epithelial beads are small yellowish-white particles formed by the accumulation of epithelial cells or the accumulation of mucous gland secretions, which mainly appear in the gums or the palate, and are yellowish-white, rice-sized particles. There may be other causes, and patients are advised to go to the hospital in time.