The hazards of congenital tooth loss are as follows: 1, the integrity of the dental row is destroyed: after tooth loss, the adjacent teeth will become tilted due to the loss of reliance and restraint, resulting in disruption of occlusal function; 2, alveolar bone atrophy: after tooth loss, normal occlusion is impossible, and the physiological stimulation of alveolar bone no longer exists. The alveolar bone will have different degrees of disuse atrophy, which will bring great difficulties to the later prosthetic restoration, maintaining the balance and stability of the oral and maxillofacial region; 3, reduced chewing function: after tooth loss, the remaining teeth undergo a series of changes, making the original good occlusal relationship change and reducing chewing efficiency; 4, food embedding: after tooth loss, the neighboring teeth move and the gap between teeth becomes larger, making After tooth loss, the neighboring teeth move and the gap between teeth becomes bigger, so that food is embedded in the gap, causing oral diseases and periodontal diseases; 5.