“How long does a blood clot last after tooth extraction?”

You want the clot to stay. That promotes bond growth. If you lose the clot you can get a dry socket. Very painful.

It needs some antibiotics.

The blood clot that forms in the socket following tooth extraction is part of the healing process, therefore, this is a difficult question for a simple answer. Fibrin threads form within the blood clot to hold the clot together and anchor it to the walls of the socket. The clot is fragile at this point and should be treated very gently lest it be disturbed and lost. With the blood clot in place, capillaries migrate down the fibrin threads and bring blood supply to the clot. Following the capillaries, osteoblast begin to lay down bone in the clot and form osteocytes. This process continues until the entire socket is full of new bone. Thus, in health, the "clot" is never lost, but is the matrix which facilitates new bone formation. 

The blood clot should remain in place as all the healing factors for good healing are in the clot. Do not dislodge the clot.

The blood clot is the bone's way to heal itself from the extraction. The blood clot actually will turn into bone over the next 6 to 12 weeks. So, it will last about that amount of time. The surrounding gingival tissue slowly grows over the blood clot and protects the clot and new forming bone. That process usually takes 1 to 2 weeks to cover the clot.

Bruce Goldman, D.M.D.

Blood clot is necessary for complete healing. It would last until the wound/socket is completely healed, about 6-8 weeks.