Incisors are the teeth in the center of the front part of the upper and lower jaws, and there are four of them in the upper and lower parts of the jaws. The lost incisors can grow if they are milk teeth, but the permanent teeth cannot grow if they are lost. Specific instructions are as follows: 1. If the lost incisors are milk teeth, they will usually grow back. Milk teeth are usually lost between the ages of 6-12 years old, and then permanent teeth will grow. You can take a dental CT in the stomatology department to see if there are any permanent teeth that have not yet grown out, and if they are orthodontically positioned, they are usually able to grow out. 2. If the incisors are permanent teeth and have been replaced, they will not grow back if they fall out due to trauma or caries. You can first take a film such as dental CT to see if there is any residual root left inside, and then choose implant denture, porcelain teeth and other methods for restoration. It is recommended to take care of your teeth in daily life, insist on cleaning your teeth once in the morning and evening, and go to the dental hospital regularly to do dental cleaning and other care work. During the period of tooth replacement, we should pay attention to the cleanliness of the mouth, and develop the good habit of brushing the teeth in the morning and evening, and rinsing the mouth after eating.