The correct term for a molar tooth should be incisor, and under normal circumstances a milk incisor will be replaced, a permanent incisor will not be replaced and will last a lifetime. In case of disease, if the permanent incisor is congenitally missing, the milk incisor will not be replaced.
1. Normal situation: there are two types of incisors, milk incisors and permanent incisors, the first to erupt are milk incisors, which will be replaced by permanent incisors during development, and the permanent incisors will not be lost and can be used for a long time. If the permanent incisors are lost due to caries, trauma, periodontal disease, etc., and no other teeth will erupt, you need to make a denture to replace the permanent incisors to exercise the function.
2. Disease conditions: If the permanent incisors are congenitally missing, then the milk incisors will not fall off automatically and will be kept in the dentition.