If your baby’s milk tooth is knocked out, you need to go to the stomatology department of the hospital in time to improve the oral X-ray, gum examination, etc., and take appropriate measures according to the degree of damage, including temporary observation, stop using the injured tooth, repairing the tooth, and extracting the tooth. 1. Temporary observation: If a piece of milk tooth is knocked out, and the root of the milk tooth is found to be undamaged after examination, and it does not affect daily life, it is enough to observe it temporarily, and no special treatment is needed in general, and it is enough to wait for the permanent teeth to grow up and be well-protected. 2. Stop using the injured tooth: When a piece of milk tooth is knocked out, regardless of the degree of damage, it is necessary to pay attention to avoid biting things with the injured tooth, so as not to aggravate the damage. 3. Repairing the tooth: If a piece of milk tooth is knocked out and the root of the milk tooth is found to be undamaged, but the size of the knocked out tooth is large, and if it is not handled in time, the pulp may be exposed, and pain in the mouth may occur, so it is necessary to repair the tooth by applying resin or glass ionomer in time. 4. Extraction of teeth: When a piece of milk tooth is knocked out and the root is found to be fractured, the tooth can no longer be retained and should be extracted as soon as possible in the hospital, so that the new tooth can be taken care of after growing out. You should take good care of your mouth, brush your teeth and rinse your mouth, and avoid eating too hard food or bumping into it again.