The reason for the swelling after tooth extraction is that the periodontium was damaged during the extraction process. The extraction socket is an invasive site for the body after root extraction, and there will be a significant inflammatory reaction at this time, just as there is redness and swelling after a finger injury. The redness and swelling will reach a peak in about 3-4 days, after which it will gradually subside as long as the patient continues with adequate anti-inflammatory treatment. It takes time for the extraction socket to heal, usually about seven days, and the patient will not feel any more redness and pain, even for more complicated procedures, the pain will be gradually eliminated in about 10-15 days. The extraction sockets take about three months to grow flat, after which the upper part of the restoration can be treated.