The white hard bump on the gum may have many causes, common ones are tooth eruption or root residue, permanent tooth obstruction, epithelial beads, alveolar bone protrusion and periapical inflammation, etc. The solutions are different for different reasons. 1, tooth eruption or root residue: it may be a tooth that is about to erupt and does not need to be treated. Or residual incompletely extracted roots, exposed at the gum as a hard bump, should be checked at the dentistry, if it is a residual root can be extracted; 2, permanent teeth obstruction: is a manifestation of long teeth, the gum can be shown as a white hard bump, the majority of obstructed teeth need to be extracted; 3, epithelial beads: also known as horse teeth. The newborn tooth embryo is formed on the dental plate, then the embryo will be detached from the dental plate to grow into teeth, and the ruptured part of the dental plate will gradually proliferate and keratinize and appear on the mucosa of the dental bed, which is the epithelial bead. Generally do not need to deal with, with growth and development, will slowly absorb or fall off; 4, alveolar bone protrusion: may be caused by congenital genetics, if there is no discomfort, can not deal with. If it affects eating and chewing, alveolar bone trimming can be done. There may also be bacterial infection, if there is local inflammation, oral anti-inflammatory drugs such as metronidazole, tinidazole and other treatment under the guidance of a doctor; 5, periapical inflammation: gums can appear white abscess, chewing pain and discomfort and other symptoms, should check the mouth mirror, X-ray, etc. to confirm the diagnosis, the acute stage need to open pulp drainage and combined with metronidazole and cephalosporin treatment, the late need for root canal treatment.