Abscesses on the gums of three-year-old babies should not be punctured. When using unsterilized instruments to puncture the abscesses, bacterial infection can be triggered, resulting in obvious swelling and pain, and the small holes on the abscesses will close quickly and will not play a role in drainage. It is better to examine the tooth in detail and take apical film before taking corresponding treatment measures, as follows: 1.If the gap of the milk tooth is large and the embedded food fiber causes bacterial multiplication, you can apply dental floss and flosser to remove the stagnant food, use 3% hydrogen peroxide solution to rinse the periodontal pocket and apply iodine glycerin to speed up the anti-inflammation. 2.If the X-ray shows the occurrence of periapical inflammation in the milk tooth, you can grind the caries cavity down from the jaw surface and remove the infected cavity. If the pulp cavity is large and causes swelling in the labial-buccal sulcus or restriction in mouth opening, the pulp cavity can be incised under local anesthesia to separate the pus cavity and place rubber strips for drainage.