It is not normal for the lateral incisors to be replaced before the mesial incisors. In most cases, the mesial incisors should be replaced before the lateral incisors, and if the mesial incisors are buried and blocked or congenitally missing, the lateral incisors will be replaced before the mesial incisors.
1. Ambush obstruction: The mesial incisors may be embedded in the alveolar bone and unable to erupt due to their position or direction of eruption. The lateral incisors will erupt at the appropriate eruption time, resulting in the lateral incisors being replaced before the central incisors.
2. Congenital absence: when the time of eruption arrives, no incisors will erupt, and the late loss of milk incisors will also cause the phenomenon that the lateral incisors will be replaced before the incisors.
If the above symptoms occur, it is recommended to go to the hospital for examination and targeted treatment after clarifying the cause.