A tooth growing on the gums of children may be caused by abnormal development of teeth, dietary reasons, chronic apical periodontitis of milk teeth. 1. Abnormal dental development: A permanent tooth will grow before the milk teeth fall out. This is due to the extrusion of the milk teeth, which causes the permanent tooth to grow in an inappropriate place, and the symptom of a tooth growing on the gums of children will appear. 2. Dietary reasons: children chew too fine, it is difficult for milk teeth to eat hard things, resulting in slow resorption of the roots of milk teeth and delayed shedding of milk teeth, which occupies the eruption channel of permanent teeth, resulting in permanent teeth can only grow out of the gums of the biased lips or the biased tongue. 3. Chronic periapical inflammation of milk teeth: Chronic inflammation of the root tips will lead to adhesion between the roots of milk teeth and the alveolar bone, resulting in the loss of milk teeth, which will cause new permanent teeth to grow out from the side of the lips, which will be manifested as a tooth growing on the gums. If you experience any of the above symptoms, it is important to have your teeth checked by a professional doctor in a timely manner.